Simplify dsptest* rule and add libavutil to the dsptest* includes.

Originally committed as revision 6011 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/Makefile

@@ -67,14 +67,14 @@ DSPDEPS = $(SRC_PATH)/libavcodec/i386/dsputil_mmx.c \
  $(SRC_PATH)/libavcodec/dsputil.h \
  $(SRC_PATH)/libavcodec/simple_idct.c
 
+DSPCFLAGS = -O4 -fomit-frame-pointer -DHAVE_AV_CONFIG_H -I.. \
+ -I$(SRC_PATH)/libavutil/ -I$(SRC_PATH)/libavcodec/i386 \
+ -I$(SRC_PATH)/libavcodec/ -lm
+
 dsptestpic: dsptest.c $(DSPDEPS)
-	$(CC) -fPIC -DPIC -O4 -fomit-frame-pointer -DHAVE_AV_CONFIG_H -I.. \
-              -I$(SRC_PATH)/libavcodec/i386 -I$(SRC_PATH)/libavcodec/ \
-              -o $@ $< -lm
+	$(CC) -fPIC -DPIC $(DSPCFLAGS) -o $@ $<
 dsptest: dsptest.c $(DSPDEPS)
-	$(CC) -O4 -fomit-frame-pointer -DHAVE_AV_CONFIG_H -I.. \
-              -I$(SRC_PATH)/libavcodec/i386 -I$(SRC_PATH)/libavcodec/ \
-              -o $@ $< -lm
+	$(CC) $(DSPCFLAGS) -o $@ $<
 
 distclean clean:
 	rm -rf vsynth1 vsynth2 data