mescc: Mes C Library: Explode linux/gnu.c.
* lib/linux/chdir.c: New file.
* lib/linux/fcntl.c: New file.
* lib/linux/fstat.c: New file.
* lib/linux/getdents.c: New file.
* lib/linux/getegid.c: New file.
* lib/linux/geteuid.c: New file.
* lib/linux/getgid.c: New file.
* lib/linux/getpid.c: New file.
* lib/linux/getppid.c: New file.
* lib/linux/getrusage.c: New file.
* lib/linux/getuid.c: New file.
* lib/linux/kill.c: New file.
* lib/linux/link.c: New file.
* lib/linux/lstat.c: New file.
* lib/linux/mkdir.c: New file.
* lib/linux/nanosleep.c: New file.
* lib/linux/pipe.c: New file.
* lib/linux/rename.c: New file.
* lib/linux/setgid.c: New file.
* lib/linux/settimer.c: New file.
* lib/linux/setuid.c: New file.
* lib/linux/signal.c: New file.
* lib/linux/sigprogmask.c: New file.
* lib/linux/gnu.c: Include them.
(chdir, fcntl, fstat, getdents, getegid, geteuid, getgid, getpid,
getppid, getrusage, getuid, kill, link, lstat, mkdir, munmap,
nanosleep, pipe, rename, setgid, settimer, setuid, signal,
sigprogmask): Remove.
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