PATCH: NPTL support for MIPS

[Roland McGrath]

> 	* elf/tls-macros.h: Add MIPS support.

This can now be a sysdeps/.../mips/tls-macros.h file.
Please do it that way.

> 	* elf/elf.h: Define MIPS TLS relocations.

Assuming this ABI is now fully cooked and committed to all around, please
post this patch separately and I'll put it in right away.

> linuxthreads/
> 	* descr.h (struct _pthread_descr_struct): Include padding if
> 	INCLUDE_TLS_PADDING.

I believe Jakub has patches that address this for other machines in some
other way.  Let's figure that all out before we add anything here.


Thanks,
Roland