nostrip_files: allow full path

The option `nostrip_files` takes a filename without path, in contrast to
option `nopie_files` which takes only full path.

This commit makes it so that `nostrip_files` can take either the
filename or the full path.

common/hooks/post-install/06-strip-and-debug-pkgs.sh

@@ -72,7 +72,7 @@ hook() {
 
 		fname=${f##*/}
 		for x in ${nostrip_files}; do
-			if [ "$x" = "$fname" ]; then
+			if [ "$x" = "$fname" -o "$x" = "${f#$PKGDESTDIR}" ]; then
 				found=1
 				break
 			fi