Fix unpack-patch not adding new files to the index

scripts/patch-tool

@@ -57,7 +57,8 @@ patch_pkg() {
     fi
 
     if [ -n "$patched" ]; then
-        git -C $pkg_dir commit -q -a -m "head.hackage.org patch"
+        git -C $pkg_dir add  . # track changes or new files added by the patch
+        git -C $pkg_dir commit -q -m "head.hackage.org patch"
     fi
 }