Fix build scripts so ksh compiles on recent macOS (Mac OS X)

This updates the cc.darwin* compiler compatibility wrapper scripts
and patches bin/package to identify a 64-bit system, allowing ksh
to build using a simple 'bin/package make' command on at least on
macOS Mojave (10.14.6). Testing on other macOS versions is invited.

src/cmd/INIT/cc.darwin:
- Remove obsolete compatibility cruft
- Update compiler flags:
  * remove obsolete/unneeded -DCLK_TCK=100 (this is already defined
    in the system header i386/limits.h included by time.h)
  * add necessary flags from Apple's Makefile in ksh-27.tar.gz:
    -DSHOPT_SPAWN=0 -D_ast_int8_t=int64_t -D_lib_memccpy
    source: https://opensource.apple.com/tarballs/ksh/
  * add -Wno-unused-value and -Wno-parentheses to suppress excessive
    clang warnings that object to David Korn's coding style.
- Update linker flags:
  * remove obsolete -Wl,-m
  * add flag from Apple's Makefile: -Wl,-search_paths_first

src/cmd/INIT/cc.darwin.i386,
src/cmd/INIT/cc.darwin.i386-64:
- Removed as superfluous (was identical to generic cc.darwin).

bin/package,
src/cmd/INIT/package.sh:
- Fix the recognition of a 64-bit system from the output of a 'file
  /bin/sh' command (what an ugly hack... never mind), so that the
  architecture is correctly identified as darwin.i386-64.

(cherry picked from commit e74e98b886a2bc5760166c124412474293f85fd8)

bin/package

@@ -2487,7 +2487,7 @@ int b() { return 0; }
 			;;
 		*)	case $bits in
 			'')	case `file /bin/sh 2>/dev/null` in
-				*universal*64*)
+				*universal*64* | *64-bit* | *x86[_-]64*)
 					pwd=`pwd`
 					cd ${TMPDIR:-/tmp}
 					tmp=hi$$

src/cmd/INIT/cc.darwin

@@ -1,4 +1,4 @@
-: unix wrapper for mac osx cc : 2012-01-20 :
+: unix wrapper for macOS cc : 2020-05-13 :
 
 HOSTTYPE=darwin.generic
 
@@ -45,29 +45,11 @@ init)	echo "cc: arguments expected" >&2
 	;;
 cpp)	$CC -E "$@"
 	;;
-cc)	$CC -DCLK_TCK=100 "$@"
+cc)	$CC -DSHOPT_SPAWN=0 -D_ast_int8_t=int64_t -D_lib_memccpy \
+		-Wno-unused-value -Wno-parentheses "$@"
 	;;
-dll)	# what a compatibility mess -- surely they can get the apis to play nice
+dll)	$CC -Wl,-flat_namespace -dynamiclib -undefined dynamic_lookup "$@"
-	tmp=/tmp/cc.${USER:-$LOGNAME}.$$.err
-	trap "rm -f $tmp" EXIT
-	case `MACOSX_DEPLOYMENT_TARGET=10.3 ld -undefined dynamic_lookup 2>&1` in
-	*undefined*dynamic_lookup*)
-		ld -m -flat_namespace -undefined suppress -dylib -dynamic \
-			-ldylib1.o "$@" -lcc_dynamic -framework System >$tmp 2>&1
-		status=$?
 	;;
-	*)	MACOSX_DEPLOYMENT_TARGET=10.3 $CC -Wl,-flat_namespace -dynamiclib -undefined dynamic_lookup "$@" >$tmp 2>&1
+ld)	$CC -Wl,-search_paths_first "$@"
-		status=$?
-		;;
-	esac
-	egrep -v ' (warning .*multiple definitions|definition) of ' $tmp >&2
-	exit $status
-	;;
-ld)	tmp=/tmp/cc.${USER:-$LOGNAME}.$$.err
-	trap "rm -f $tmp" EXIT
-	$CC -Wl,-m -DCLK_TCK=100 "$@" >$tmp 2>&1
-	status=$?
-	egrep -v ' (warning .*multiple definitions of|definition of|as lazy binding|not from earlier dynamic) ' $tmp >&2
-	exit $status
 	;;
 esac

src/cmd/INIT/cc.darwin.i386

@@ -1,73 +0,0 @@
-: unix wrapper for mac osx cc : 2012-02-29 :
-
-HOSTTYPE=darwin.i386
-
-case " $* " in
-*" -dumpmachine "*) echo $HOSTTYPE; exit ;;
-esac
-
-CC='/usr/bin/cc -m32'
-op=init
-for arg
-do	case $op in
-	init)	op=ld
-		set ''
-		;;
-	esac
-	case $arg in
-	-c)	op=cc
-		;;
-	-E)	op=cpp
-		continue
-		;;
-	-G)	op=dll
-		continue
-		;;
-	-lc)	continue
-		;;
-	-lm)	continue
-		;;
-	-O)	continue
-		;;
-	esac
-	set "$@" "$arg"
-done
-case $# in
-0)	;;
-*)	shift ;;
-esac
-case $* in
--v)	$CC "$@"; exit ;;
-esac
-case $op in
-init)	echo "cc: arguments expected" >&2
-	exit 1
-	;;
-cpp)	$CC -E "$@"
-	;;
-cc)	$CC -DCLK_TCK=100 "$@"
-	;;
-dll)	# what a compatibility mess -- surely they can get the apis to play nice
-	tmp=/tmp/cc.${USER:-$LOGNAME}.$$.err
-	trap "rm -f $tmp" EXIT
-	case `MACOSX_DEPLOYMENT_TARGET=10.3 ld -undefined dynamic_lookup 2>&1` in
-	*undefined*dynamic_lookup*)
-		ld -m -flat_namespace -undefined suppress -dylib -dynamic \
-			-ldylib1.o "$@" -lcc_dynamic -framework System >$tmp 2>&1
-		status=$?
-		;;
-	*)	MACOSX_DEPLOYMENT_TARGET=10.3 $CC -Wl,-flat_namespace -dynamiclib -undefined dynamic_lookup "$@" >$tmp 2>&1
-		status=$?
-		;;
-	esac
-	egrep -v ' (warning .*multiple definitions|definition) of ' $tmp >&2
-	exit $status
-	;;
-ld)	tmp=/tmp/cc.${USER:-$LOGNAME}.$$.err
-	trap "rm -f $tmp" EXIT
-	$CC -Wl,-m -DCLK_TCK=100 "$@" >$tmp 2>&1
-	status=$?
-	egrep -v ' (warning .*multiple definitions of|definition of|as lazy binding|not from earlier dynamic) ' $tmp >&2
-	exit $status
-	;;
-esac

src/cmd/INIT/cc.darwin.i386-64

@@ -1,73 +0,0 @@
-: unix wrapper for mac osx cc : 2012-02-29 :
-
-HOSTTYPE=darwin.i386-64
-
-case " $* " in
-*" -dumpmachine "*) echo $HOSTTYPE; exit ;;
-esac
-
-CC=/usr/bin/cc
-op=init
-for arg
-do	case $op in
-	init)	op=ld
-		set ''
-		;;
-	esac
-	case $arg in
-	-c)	op=cc
-		;;
-	-E)	op=cpp
-		continue
-		;;
-	-G)	op=dll
-		continue
-		;;
-	-lc)	continue
-		;;
-	-lm)	continue
-		;;
-	-O)	continue
-		;;
-	esac
-	set "$@" "$arg"
-done
-case $# in
-0)	;;
-*)	shift ;;
-esac
-case $* in
--v)	$CC "$@"; exit ;;
-esac
-case $op in
-init)	echo "cc: arguments expected" >&2
-	exit 1
-	;;
-cpp)	$CC -E "$@"
-	;;
-cc)	$CC -DCLK_TCK=100 "$@"
-	;;
-dll)	# what a compatibility mess -- surely they can get the apis to play nice
-	tmp=/tmp/cc.${USER:-$LOGNAME}.$$.err
-	trap "rm -f $tmp" EXIT
-	case `MACOSX_DEPLOYMENT_TARGET=10.3 ld -undefined dynamic_lookup 2>&1` in
-	*undefined*dynamic_lookup*)
-		ld -m -flat_namespace -undefined suppress -dylib -dynamic \
-			-ldylib1.o "$@" -lcc_dynamic -framework System >$tmp 2>&1
-		status=$?
-		;;
-	*)	MACOSX_DEPLOYMENT_TARGET=10.3 $CC -Wl,-flat_namespace -dynamiclib -undefined dynamic_lookup "$@" >$tmp 2>&1
-		status=$?
-		;;
-	esac
-	egrep -v ' (warning .*multiple definitions|definition) of ' $tmp >&2
-	exit $status
-	;;
-ld)	tmp=/tmp/cc.${USER:-$LOGNAME}.$$.err
-	trap "rm -f $tmp" EXIT
-	$CC -Wl,-m -DCLK_TCK=100 "$@" >$tmp 2>&1
-	status=$?
-	egrep -v ' (warning .*multiple definitions of|definition of|as lazy binding|not from earlier dynamic) ' $tmp >&2
-	exit $status
-	;;
-esac

src/cmd/INIT/package.sh

@@ -2486,7 +2486,7 @@ int b() { return 0; }
 			;;
 		*)	case $bits in
 			'')	case `file /bin/sh 2>/dev/null` in
-				*universal*64*)
+				*universal*64* | *64-bit* | *x86[_-]64*)
 					pwd=`pwd`
 					cd ${TMPDIR:-/tmp}
 					tmp=hi$$