FATE: print friendly error for individual tests when SAMPLES unset

Originally committed as revision 23079 to svn://svn.ffmpeg.org/ffmpeg/trunk

Makefile

@@ -339,14 +339,15 @@ tests/data/asynth1.sw: tests/audiogen$(HOSTEXESUF)
 tests/seek_test$(EXESUF): tests/seek_test.o $(FF_DEP_LIBS)
 	$(LD) $(FF_LDFLAGS) -o $@ $< $(FF_EXTRALIBS)
 
-ifdef SAMPLES
 include $(SRC_PATH_BARE)/tests/fate.mak
+
+ifdef SAMPLES
 fate: $(FATE_TESTS)
 $(FATE_TESTS): ffmpeg$(EXESUF)
 	@echo "TEST FATE   $(@:fate-%=%)"
 	@$(SRC_PATH)/tests/fate-run.sh $@ "$(SAMPLES)" "$(TARGET_EXEC)" "$(TARGET_PATH)" '$(CMD)'
 else
-fate:
+fate $(FATE_TESTS):
 	@echo "SAMPLES not specified, cannot run FATE"
 endif