Only compile snowdsp_mmx.c if the Snow decoder is enabled.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@8117 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/Makefile

@@ -327,10 +327,10 @@ OBJS += i386/fdct_mmx.o \
         i386/vp3dsp_sse2.o \
         i386/fft_3dn.o \
         i386/fft_3dn2.o \
-        i386/snowdsp_mmx.o \
 
 OBJS-$(CONFIG_GPL)                     += i386/idct_mmx.o
 OBJS-$(CONFIG_CAVS_DECODER)            += i386/cavsdsp_mmx.o
+OBJS-$(CONFIG_SNOW_DECODER)            += i386/snowdsp_mmx.o
 endif
 
 # armv4l specific stuff