build: Update *.m4 from libraries.
* m4/gpg-error.m4: Update from master. * m4/ksba.m4: Ditto. * m4/libassuan.m4: Ditto. * m4/libgcrypt.m4: Ditto. * m4/npth.m4: Ditto. * m4/ntbtls.m4: Ditto.
Do it again today.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>