Remove ineffectual hack that attempts to build ppc/check_altivec.o without

AltiVec flags. The flags are set by configure and used to compile all files
anyway. Setting extra AltiVec options here just duplicates them for the files
for which they are set.

Originally committed as revision 15959 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -468,10 +468,6 @@ ALTIVEC-OBJS-$(CONFIG_SNOW_DECODER)    += ppc/snow_altivec.o
 ALTIVEC-OBJS-$(CONFIG_VC1_DECODER)     += ppc/vc1dsp_altivec.o
 ALTIVEC-OBJS-$(CONFIG_WMV3_DECODER)    += ppc/vc1dsp_altivec.o
 
-# -maltivec is needed in order to build AltiVec code.
-$(addprefix $(SUBDIR),$(ALTIVEC-OBJS-yes)): CFLAGS += -maltivec -mabi=altivec
-
-# check_altivec must be built without -maltivec
 OBJS-$(HAVE_ALTIVEC)                   += $(ALTIVEC-OBJS-yes)           \
                                           ppc/check_altivec.o