nptl: Simplify libpthread.so ruleshjl/pr22362/symlink

libpthread.so must be created against a special crti.o and when multi-lib
GCC is used to build glibc, the special crti.o must be placed under the
`gcc -print-multi-directory` subdirectory so that -B$(common-objpfx)nptl/
will pick it up.  This patch compiles the special crti.o directly with
"-include pt-crti.h" and uses the new make-link-multidir from the fix
for [BZ #22362] to create the symlink for the multi-lib subdirectory.
It simplifies libpthread.so rules to support -B$(common-objpfx)nptl/
and -B$(common-objpfx)/ for correct crt*.o files.

Tested on x86-64 for x86-64, i686 and x32.

	* nptl/Makefile (multidir.mk): Don't generate.
	($(objpfx)multidir.mk): Removed.
	(crtn-objs): Likewise.
	(generated-dirs): Don't add $(multidir).
	(multilib-crti-objs): New.
	(extra-objs): Use $(multilib-crti-objs).  Don't add pt-crti.o.
	($(objpfx)libpthread.so): Removed.
	(CPPFLAGS-crti.o): New.
	($(objpfx)crti.o): Removed.
	($(objpfx)$(multidir)/crti.o): Likewise.
	($(objpfx)$(multidir)/crtn.o): Likewise.
	($(addprefix $(objpfx)$(multidir)/, $(crti-objs))): New target.
	(generated): Remove multidir.mk.
	* nptl/pt-crti.S: Renamed to ...
	* nptl/pt-crti.h: This.  Don't include <crti.S>.

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