[committed] fix PR libobjc/20252, multilib and libobjc

[Andrew Pinski <pinskia at physics dot uc dot edu>]

Paolo did not test his libobjc patch on a mutlilib target; if he did he 
would noticed
that it would break there.  This fixes the problem by removing the way 
we figure out
if we need to define HAVE_GTHR_DEFAULT.  Instead I copied how libstdc++ 
(and libobjc)
figures it out by parsing "gcc -v" and looking for "Thread model".

Committed after testing on powerpc-darwin7.x (even though this is not a 
multilib
target).

Thanks,
Andrew Pinski

ChangeLog:
	* Makefile.in (GTHREAD_FLAGS): Remove.
	(ALL_CFLAGS): Remove usage of GTHREAD_FLAGS.
	* thr-objc.c: Include config.h.
	* configure.ac: Instead of looking at GCC's makefile, figure out if
	GTHREAD_FLAGS should be defined by looking at the `thread model'
	of the current gcc.
	* configure: Regenerate.
	* config.h.in: Regenerate.

Patch:

Attachment: fix_thread.diff.txt
Description: Text document