Fix build with compiler defining __i686 (bug 411)

[Roland McGrath]

> 2012-02-03  Joseph Myers  <joseph@codesourcery.com>
> 
> 	* sysdeps/i386/sysdep.h (GET_PC_THUNK, GET_PC_THUNK_STR): Define.
> 	(SETUP_PIC_REG): Use GET_PC_THUNK.
> 	* sysdeps/unix/sysv/linux/i386/sysdep.h: Use GET_PC_THUNK_STR
> 	macro.

Looks fine to me, with the same proviso about disassembly comparison
for paranoia's sake.


Thanks,
Roland