Remove redundant mm_flags declaration, fixes the warning:

libavcodec.a(dsputil_ppc.o): warning: definition of `mm_flags' overriding common
fft-test.o: warning: common is here


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@13940 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/fft-test.c

@@ -33,8 +33,6 @@
 #undef exit
 #undef random
 
-int mm_flags;
-
 /* reference fft */
 
 #define MUL16(a,b) ((a) * (b))