typeset: Fix stack fencepost error, ISO C90 compat (#159)

src/cmd/ksh93/bltins/typeset.c:
- The new_argv[] array was one item too short (should be argc+2).
- Use AST stakalloc(3) to allocate it instead of a dynamic array;
  this restores compatibility with ISO C90.

src/lib/libast/features/standards, src/cmd/INIT/cc.unixware.i386:
- Add support for UnixWare.
- Do not define any standards macros on this system, as on FreeBSD
  and DragonFly BSD.

src/cmd/INIT/Makefile

@@ -60,7 +60,7 @@ cc ld ldd :PACKAGE_INIT: mamake.c proto.c ratz.c release.c
 	cc.sco.i386 \
 	cc.sgi.mips2 cc.sgi.mips3 cc.sgi.mips3-o32 cc.sgi.mips4 \
 	cc.sgi.mips4-n32 ldd.sgi \
-	cc.unix.mc68k
+	cc.unix.mc68k cc.unixware.i386
 
 LICENSE : .DONTCARE
 

src/cmd/INIT/cc.unixware.i386

@@ -0,0 +1,9 @@
+: unixware.i386 cc wrapper
+
+HOSTTYPE=unixware.i386
+
+case " $* " in
+*" -dumpmachine "*) echo $HOSTTYPE; exit ;;
+esac
+
+/bin/cc -D_XOPEN_UNIX -D_XOPEN_SOURCE_EXTENDED "$@"