Log Message:
libgpg-error: updated to 1.28

changes in version 1.28:

 * The formerly internal yat2m tool is now installed for a native
   build.

 * The new files gpgrt.m4 and gpgrt-config are now installed.  They
   can be used instead of gpg-error.m4 and gpg-error-config.

 * New logging functions similar to those used by GnuPG.

 * New helper functions for platform abstraction.