b-i-b status on Darwin

[David Edelsohn]

>>>>> Geoff Keating writes:

Geoff> In file included from
Geoff> /Network/Servers/cauchy/homes/thorin/gkeating/co/basic-improvement/gcc/gcc/config/darwin-c.c:26:
Geoff> tm.h:8:29: insn-constants.h: No such file or directory
Geoff> tm.h:9:25: insn-flags.h: No such file or directory

	This is the same type of dependency problem that occurred for
rs6000-c.c .  The darwin-c.c dependency needs coretypes.h and $(TM_H) added.
See gcc/config/rs6000/t-rs6000-c-rule.

	Devang also mentioned the Darwin stub error.

	The 32x64 cross limitation prevents GCC for PPC64 Linux, GCC for
x86_64, and GCC for AIX as a 32-bit apps from building.

David