PATCH: NPTL support for MIPS

[Roland McGrath]

> This is entirely within LinuxThreads.  Both libc.so and libpthread.so
> will try to access p_errno, which has to be at a common offset in this
> structure.  This "padding" is unused in libc.so, but used in
> libpthread.so, and it lives before p_errno - so when it isn't included,
> libc clobbers the wrong location in the descriptor when it tries to set
> errno.

Why is it located there?