Ever since shared-mime-info-0.21-r1 it was made to install the pkgconfig .pc file into ${libdir}/pkgconfig instead of ${datadir}/pkgconfig. This is wrong and we should kill this patch. The reason is that there is nothing arch specific in the pkgconfig file. No CFLAGS, no nothing that would make it 32 or 64 bit specific, therefore it belongs to datadir, not libdir. See http://bugs.freedesktop.org/show_bug.cgi?id=10698 for upstream reasoning of the same.
done, thanks