build: Update build-aux and m4 from libgpg-error and libassuan.
* build-aux/compile, build-aux/depcomp, build-aux/ltmain.sh: Update. * build-aux/mdate-sh, build-aux/missing: Likewise. * m4/autobuild.m4, m4/gpg-error.m4, m4/libassuan.m4: Likewise. * m4/libtool.m4, m4/ltoptions.m4, m4/ltsugar.m4: Likewise. * m4/ltversion.m4, m4/lt~obsolete.m4: Likewise.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>