fixed SRC_PATH usage

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@1929 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

tests/Makefile

@@ -36,7 +36,7 @@ vsynth1/0.pgm: videogen
 
 vsynth2/0.pgm: rotozoom
 	@mkdir -p vsynth2
-	./rotozoom 'vsynth2/'
+	./rotozoom 'vsynth2/' $(SRC_PATH)/tests/lena.pnm
 
 videogen: videogen.c
 	$(CC) $(LDFLAGS) $(CFLAGS) -o $@ $<