Build on more darwin/macOS versions

src/cmd/INIT/cc.darwin*:
- Build on ancient Mac OS X gcc versions (darwin 7+, Mac OS X
  10.3+), more recent gcc versions (darwin 11+, Mac OS X 10.7+), as
  well as current clang versions. So there are now three cc.darwin*
  wrapper scripts for these different darwin versions.

bin/package, src/cmd/INIT/package.sh:
- Differentiate the host ID and pick the correct Darwin script based on
  the detected OS release version.

bin/package

@@ -2396,7 +2396,10 @@ int main()
 			case $lhs in
 			bsdi)			lhs=bsd ;;
 			darwin)			case $(/usr/bin/cc --version) in
-						*'(GCC)'*)	lhs=${lhs}_old ;;
+						*'(GCC)'*)	case $rel in
+								[0-9].*|10.*)	lhs=darwin07 ;;
+								*)		lhs=darwin11 ;;
+								esac ;;
 						esac
 						;;
 			freebsd)		case $rel in

src/cmd/INIT/cc.darwin07

@@ -1,6 +1,6 @@
-: unix wrapper for mac osx cc : 2012-01-20 :
+: unix wrapper for Mac OS X 10.3-10.6 (Darwin 7-10) cc : 2012-01-20 :
 
-HOSTTYPE=darwin.generic
+HOSTTYPE=darwin07.generic
 
 case " $* " in
 *" -dumpmachine "*) echo $HOSTTYPE; exit ;;

src/cmd/INIT/cc.darwin11

@@ -0,0 +1,73 @@
+: unix wrapper for Mac OS X 10.7 (Darwin 11) cc : 2013-11-07 :
+
+HOSTTYPE=darwin11.generic
+
+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}.$$.err
+	trap "rm -f $tmp" EXIT
+	case `MACOSX_DEPLOYMENT_TARGET=10.7 ld -undefined dynamic_lookup 2>&1` in
+	*undefined*dynamic_lookup*)
+		ld -m -flat_namespace -undefined suppress -dylib -dynamic \
+			-ldylib1.o "$@" -lcc_dynamic -framework System >$tmp 2>&1
+		status=$?
+		;;
+	*)	MACOSX_DEPLOYMENT_TARGET=10.7 $CC -Wl,-flat_namespace -dynamiclib -undefined dynamic_lookup "$@" >$tmp 2>&1
+		status=$?
+		;;
+	esac
+	egrep -v ' (warning .*multiple definitions|definition) of ' $tmp >&2
+	exit $status
+	;;
+ld)	tmp=/tmp/cc.${USER:-$LOGNAME}.$$.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

@@ -2395,7 +2395,10 @@ int main()
 			case $lhs in
 			bsdi)			lhs=bsd ;;
 			darwin)			case $(/usr/bin/cc --version) in
-						*'(GCC)'*)	lhs=${lhs}_old ;;
+						*'(GCC)'*)	case $rel in
+								[0-9].*|10.*)	lhs=darwin07 ;;
+								*)		lhs=darwin11 ;;
+								esac ;;
 						esac
 						;;
 			freebsd)		case $rel in