Fix SPARC atomic_write_barrier.
Move powerpc64 pread/pwrite definitions to syscalls.list (bug 14138).

Concluding the move of syscall definitions to syscalls.list, where the
removal of support for old kernel versions has made this possible,
this patch removes C definitions of pread, pread64, pwrite and
pwrite64 for powerpc64.  As far as I can tell, the existing
syscalls.list definitions in
sysdeps/unix/sysv/linux/wordsize-64/syscalls.list should suffice to
produce results equivalent to what these C files do.

	[BZ #14138]
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/pread.c: Remove file.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/pread64.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/pwrite.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/pwrite64.c: Likewise.
Add bug 15215 to NEWS; move bug 17344 to correct version's list in NEWS.
Remove __libc_pselect alias.

Continuing the removal of unused __libc_* function names, this patch
removes the __libc_pselect alias.

Tested for x86_64 that installed stripped shared libraries are
unchanged by this patch.

	* misc/pselect.c [!__pselect] (__libc_pselect): Remove alias.
	* sysdeps/unix/sysv/linux/pselect.c [__NR_pselect6]
	(__libc_pselect): Likewise.
Update autoconf version requirement in install.texi.

I noticed that install.texi was out of date with regard to the actual
autoconf version requirement for regenerating configure scripts.  This
patch updates the documentation.

	* manual/install.texi (Tools for Compilation): Update autoconf
	version requirements.
	* INSTALL: Regenerated.
BZ#17496: Fix gnu/lib-names.h dependency.
Add a hook to enable load-time inspection of program headers

This hook can be used to perform additional compatibility checks
between shared libraries by inspecting custom program header
information.

	* elf/dl-machine-reject-phdr.h: New file.
	* elf/dl-load.c: #include that.
	(open_verify): Call elf_machine_reject_phdr_p and ignore the file
	if that returned true.
powerpc: Change atomic_write_barrier to have release semantics.
Make aclocal.m4 comment mention updating install.texi for autoconf version.

	* aclocal.m4 (GLIBC_AUTOCONF_VERSION): Mention need to update
	install.texi in comment.