Simplify CLEANFILES make variable by using wildcards.

Also ensures that generated file cos_fixed_tables.c is deleted on 'make clean'.

libavcodec/Makefile

@@ -670,7 +670,7 @@ HOSTPROGS = costablegen
 
 DIRS = alpha arm bfin mlib ppc ps2 sh4 sparc x86
 
-CLEANFILES = sin_tables.c cos_tables.c *_tables.h *_tablegen$(HOSTEXESUF)
+CLEANFILES = *_tables.c *_tables.h *_tablegen$(HOSTEXESUF)
 
 include $(SUBDIR)../subdir.mak