* m4/gnulib-cache.m4: Add `inet_ntop' and `inet_pton'.
* configure.ac: Don't check for `inet_ntop' and `inet_pton'.
* libguile/socket.c (scm_inet_pton, scm_inet_ntop): Compile regardless
of `HAVE_INET_PTON' and `HAVE_INET_NTOP' respectively.
* libguile/filesys.c: Use <stdlib.h> instead of <canonicalize.h>.
* m4/gnulib-cache.m4 (gl_MODULES): Add `flock' (provides flock(2)
declaration and implementation), `fpieee' (fixes floating point
behavior on Alpha and SH), `stdlib' (provides an unsetenv(3)
declaration, among others), `putenv' (provides a putenv(3) declaration
and implementation with the semantics we need).
