Fix imgresample-test compilation.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@6560 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/Makefile

@@ -440,7 +440,7 @@ cpuid_test: i386/cputest.c
 # testing progs
 
 imgresample-test: imgresample.c $(LIB)
-	$(CC) $(CFLAGS) -DTEST -o $@ $^ -lm
+	$(CC) $(CFLAGS) -DTEST -o $@ $^ $(EXTRALIBS)
 
 dct-test: dct-test.o fdctref.o $(LIB)
 	$(CC) -o $@ $^ $(EXTRALIBS)