build: Let configure create the VERSION file.
* autogen.sh: Update from libgpg-error. * configure.ac: Use mym4_versoin to create VERSION file. * Makefile.am (dist-hook): Do not create VERSION file. (EXTRA_DIST): Add VERSION.
- GnuPG-bug-id: T3283
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>