Update powerpc-fpu ULPs.
Move x86_64 code out of nptl/ subdirectory.
posix_spawn_faction_addopen: Add missing string.h include directive

This is needed to avoid a PLT call on s390.
Move SH code out of nptl/ subdirectory.
Move i386 code out of nptl/ subdirectory.
Consolidate NPTL sigprocmask.
Get rid of nptl/sysdeps/pthread/ subdirectory
Use list.h in posix-timer code.
SPARC: Convert fork.c to arch-fork.h
SPARC: Define TLS_DEFINE_INIT_TP
Move SPARC code out of nptl/sysdeps/sparc/.
Move SPARC public headers out of nptl/