Newer versions of libgpg-error removes gpg-error-config

downstream issue: https://github.com/msys2/MINGW-packages/issues/13539

Starting around libgpg-error version 1.46, libgpg-error no longer provides gpg-error-config that is searched for https://code.videolan.org/videolan/libbdplus/-/blob/master/configure.ac#L146

two proposals available to upstream is to use gpgrt-config file instead of gpg-error-config file and to check for both gpgrt-config and gpg-error-config file (like libksba)