makepkg: only strip files that are writable

TODO: http://mailman.archlinux.org/pipermail/pacman-dev/2010-January/010390.html

Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>

scripts/makepkg.sh.in

@@ -849,7 +849,7 @@ tidy_install() {
 	if [[ $(check_option strip) = y && -n ${STRIP_DIRS[*]} ]]; then
 		msg2 "$(gettext "Stripping debugging symbols from binaries and libraries...")"
 		local binary
-		find ${STRIP_DIRS[@]} -type f 2>/dev/null | while read binary ; do
+		find ${STRIP_DIRS[@]} -type f -writable 2>/dev/null | while read binary ; do
 			case "$(file -biz "$binary")" in
 				*compressed-encoding*)      # Skip compressed binaries
 					;;