gbuild: UnpackedTarball: print which patch failed to apply

Change-Id: I5536d92c381a0df425a7d70387f1ebc457e68186

solenv/gbuild/UnpackedTarball.mk

@@ -136,7 +136,8 @@ $(call gb_Helper_abbreviate_dirs,\
 			for p in $(UNPACKED_PATCHES); do \
 				pl=$(UNPACKED_PATCHLEVEL); \
 				s=$${p##*.}; case "$$s" in [0-9]$(CLOSE_PAREN) pl="$$s"; ;; esac ; \
-				$(GNUPATCH) -s -p$$pl < "$$p" || exit 1;\
+				$(GNUPATCH) -s "-p$$pl" < "$$p"; \
+				if test "$$?" -ne 0; then echo "Patch FAILED: $$p"; exit 1; fi;\
 			done && \
 		) \
 		$(foreach file,$(UNPACKED_FIX_EOL),$(call gb_UnpackedTarball_CONVERTTODOS,$(file)) && ) \