New module 'random'.

New module 'random'.

* lib/stdlib.in.h (random, srandom, initstate, setstate): New
declarations.
* lib/random.c: New file, based on glibc/stdlib/random.c.
* m4/random.m4: New file.
* m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Initialize GNULIB_RANDOM,
HAVE_RANDOM.
* modules/stdlib (Makefile.am): Substitute GNULIB_RANDOM, HAVE_RANDOM.
* modules/random: New file.
* config/srclist.txt: Add an entry for random.c.
* doc/posix-functions/random.texi: Mention the 'random' module.
* doc/posix-functions/initstate.texi: Likewise.
* doc/posix-functions/setstate.texi: Likewise.
* doc/posix-functions/srandom.texi: Likewise.