Remove EXTRADEPS from common.mak since it is no longer used

Originally committed as revision 9766 to svn://svn.ffmpeg.org/ffmpeg/trunk

common.mak

@@ -19,7 +19,7 @@ OBJS := $(OBJS) $(ASM_OBJS) $(CPPOBJS)
 STATIC_OBJS := $(OBJS) $(STATIC_OBJS)
 SHARED_OBJS := $(OBJS) $(SHARED_OBJS)
 
-all: $(EXTRADEPS) $(LIB) $(SLIBNAME)
+all: $(LIB) $(SLIBNAME)
 
 $(LIB): $(STATIC_OBJS)
 	rm -f $@