Fix the self tests which are contained in some codecs and are using random().

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@9754 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/dct-test.c

@@ -42,6 +42,7 @@
 #endif
 
 #undef printf
+#undef random
 
 void *fast_memcpy(void *a, const void *b, size_t c){return memcpy(a,b,c);};
 

libavcodec/fft-test.c

@@ -31,6 +31,7 @@
 #include <string.h>
 
 #undef exit
+#undef random
 
 int mm_flags;
 

libavcodec/motion-test.c

@@ -35,6 +35,7 @@
 
 #undef exit
 #undef printf
+#undef random
 
 #define WIDTH 64
 #define HEIGHT 64