kbuild/mkspec: clean boot loader configuration on rpm removal

This patch add a rpm preuninstall scriptlet to cleanup the
boot loader configuration on kernel package uninstall.
The initrd for the to-be-removed kernel is deleted, too.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Michal Marek <mmarek@suse.com>

scripts/package/mkspec

@@ -138,6 +138,11 @@ echo "/sbin/installkernel $KERNELRELEASE /boot/.vmlinuz-$KERNELRELEASE-rpm /boot
 echo "rm -f /boot/.vmlinuz-$KERNELRELEASE-rpm /boot/.System.map-$KERNELRELEASE-rpm"
 echo "fi"
 echo ""
+echo "%preun"
+echo "if [ -x /sbin/new-kernel-pkg ]; then"
+echo "new-kernel-pkg --remove $KERNELRELEASE --rminitrd --initrdfile=/boot/initramfs-$KERNELRELEASE.img"
+echo "fi"
+echo ""
 echo "%files"
 echo '%defattr (-, root, root)'
 echo "/lib/modules/$KERNELRELEASE"