* m4/gpg-error.m4: Update from libgpg-error 1.33.
* src/ksba.m4: Don't require AM_PATH_GPG_ERROR.  Use GPGRT_CONFIG when
it is confirmed that it is available and working well.
* configure.ac (AM_PATH_GPG_ERROR): No requirement for newer version
(It was because of new gpgrt-config which supports *.pc files).