gpg-error-config: Fix cross build support.
* configure.ac: Fix regexp matching multiarch environment. * src/gpg-error-config-new.in: Support standard cross build. Handle the case where $multiarch != $triplet.
For standard cross build, use @exec_prefix@/$triplet/lib/pkgconfig.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>