grub_0.97: Fix to correctly ship files under /usr/lib
The grub_fix_for_automake-1.12.patch replaced pkglib with pkgdata to
make grub_0.97 build with automake-1.12. However, it forgot to set up
the pkgdatadir, thus causing grub_0.97 not shipping files under /usr/lib.
This in turn resulted in an unworkable grub.
This patch fixes this problem by setting up the pkgdatadir correctly.
