In libobjc/:
Implemented objc_sync_enter() and objc_sync_exit(), which are
required by @synchronized() to work.
* objc-sync.c: New file.
* objc/objc-sync.h: New file.
* objc-private/objc-sync.h: New file.
* init.c (__objc_exec_class): Call __objc_sync_init() during the
Objective-C runtime startup.
* Makefile.in: Added objc-sync.c and objc-sync.h.
* configure.ac: Added GCC_CHECK_TLS.
* acinclude.m4: Include ../config/enable.m4 and ../config/tls.m4.
* configure: Regenerated.
* config.h.in: Regenerated.
From-SVN: r164276
