Update to newer gnulib.
* gnulib: Update.
* ltdl/m4/gnulib-cache.m4: Import inttypes, setenv, and unsetenv
modules.
* modules/m4.c (m4_make_temp): Adjust gen_tempname client.
* bootstrap (src_modules): Pick up getopt-gnu and its
dependencies.
* configure.ac (gl_VERSION_ETC): Support ./configure
--with-packager.
(AC_CHECK_FUNCS_ONCE): Rely on gnulib for setenv, unsetenv.
* ltdl/m4/m4-getopt.m4: Rewrite to match current gnulib.
* Makefile.am (src/getopt.h): Likewise.
* modules/stdlib.c (setenv, unsetenv): Rely on gnulib.
Signed-off-by: Eric Blake <ebb9@byu.net>