Consistently use $(BUILD_ROOT).

Originally committed as revision 6699 to svn://svn.ffmpeg.org/ffmpeg/trunk

Makefile

@@ -58,7 +58,7 @@ endif
 
 OBJS = ffmpeg.o ffserver.o cmdutils.o ffplay.o
 SRCS = $(OBJS:.o=.c) $(ASM_OBJS:.o=.s)
-LDFLAGS := -L./libavformat -L./libavcodec -L./libavutil $(LDFLAGS)
+LDFLAGS := -L$(BUILD_ROOT)/libavformat -L$(BUILD_ROOT)/libavcodec -L$(BUILD_ROOT)/libavutil $(LDFLAGS)
 EXTRALIBS := -lavformat$(BUILDSUF) -lavcodec$(BUILDSUF) -lavutil$(BUILDSUF) $(EXTRALIBS)
 
 ifeq ($(CONFIG_SWSCALER),yes)