[PATCH] Fix binary compatibility of bits/types.h

[Steve Munroe]

Ulrich Drepper writes:

> But this is exactly what we are talking about.  Keeping the size alone
> isn't enough.  The mangled name in C++ mustn't change either.

This change does create a problem for powerpc and the new c++-types-check. 
The data file names are only qualified with $base-machine (as in 
c++-types-powerpc-linux-gnu.data) but 64-bit types will require different 
data files between powerpc32 and powerpc64. Perhaps libc/Makefile can 
check scripts/c++-types-$(base-machine)-$(config-os).data and if not found 
try scripts/c++-types-$(config-machine)-$(config-os).data?

There also seems to be a problem with pthread_t between linuxthreads and 
nptl. pthread_t:m is OK for Linuxthreads but nplt needs 
pthread_t:P16__opaque_pthread.