* Makefile.am: Add include files under bits sub-directory.
* Makefile.in: Regenerated.
* libc/sys/linux/argp/argp-fs-xinl.c: Set __OPTIMIZE__ to
actual value of 1 to be compatible with newer glibc headers.
* libc/sys/linux/sys/cdefs.h: Fix to be compatible with newer
glibc headers.
* libc/sys/linux/sys/dirent.h: Ditto.
* libc/sys/linux/argp/argp-xinl.c: Ditto.
* libc/sys/linux/dl/dl-runtime.c: Make sure fixup and
profile_fixup routines are marked used so they won't be
optimized away.
* libc/sys/linux/dl/dl-cache.c: Don't use weak_extern macro
to mark functions as weak.
* libc/sys/linux/dl/dl-open.c: Ditto.
* libc/sys/linux/iconv/gconv_open.c: Fix to obey new gcc4
rules about lvalues.
* libc/sys/linux/iconv/gconv_simple.c: Ditto.
* libc/sys/linux/linuxthreads/bits/libc-lock.h: Don't use
weak_extern macro to mark functions as weak. Instead always
use #pragma weak.
* iconvdata/jis0208.h: Fix to work with gcc4.
* libc/sys/linux/dl/dl-load.c: Ditto.
* libc/sys/linux/dl/dl-reloc.c: Ditto.
* libc/sys/linux/dl/do-rel.h: Ditto.
* libc/sys/linux/dl/dynamic-link.h: Ditto.
* libc/sys/linux/include/ltdl.h: Ditto.
* libc/sys/linux/machine/i386/dl-machine.h: Ditto.
* libc/sys/linux/machine/i386/weakalias.h: Ditto.
* libc/sys/linux/net/ns_ntoa.c: Ditto.
* libc/sys/linux/bits/initspin.h: New file.
* libc/sys/linux/bits/libc-lock.h: Ditto.
* libc/sys/linux/bits/pthreadtypes.h: Ditto.
* libc/sys/linux/bits/typesizes.h: Ditto.
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