build: make postinst/prerm scripts executable

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45128 3c298f89-4303-0410-b956-a3cf2f4a3e73

include/package-ipkg.mk

@@ -203,7 +203,7 @@ $(_endef)
 			echo ". \$$$${IPKG_INSTROOT}/lib/functions.sh"; \
 			echo "default_prerm \$$$$0 \$$$$@"; \
 		) > prerm; \
-		chmod 0755 prerm; \
+		chmod 0755 postinst prerm; \
 		$($(1)_COMMANDS) \
 	)