Simplify compilation call by using $(EXTRALIBS).

git-svn-id: file:///var/local/repositories/mplayer/trunk/libswscale@20038 b3059339-0415-0410-9bf9-f77b7e298cf2

Makefile

@@ -23,7 +23,7 @@ HEADERS = swscale.h rgb2rgb.h
 include $(SRC_PATH)/common.mak
 
 cs_test: cs_test.c
-	$(CC) $(CFLAGS) -o $@ $^ -L. -lswscale -L$(SRC_PATH)/libavutil -lavutil -lm
+	$(CC) $(CFLAGS) -o $@ $^ -L. -lswscale $(EXTRALIBS)
 
 swscale-example: swscale-example.c
-	$(CC) $(CFLAGS) -o $@ $^ -L. -lswscale -L$(SRC_PATH)/libavutil -lavutil -lm
+	$(CC) $(CFLAGS) -o $@ $^ -L. -lswscale $(EXTRALIBS)