time & (s)rand is forbidden

Originally committed as revision 2954 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/common.h

@@ -1276,6 +1276,9 @@ tend= rdtsc();\
 #define malloc please_use_av_malloc
 #define free please_use_av_free
 #define realloc please_use_av_realloc
+#define time time_is_forbidden_due_to_security_issues
+#define rand rand_is_forbidden_due_to_state_trashing
+#define srand srand_is_forbidden_due_to_state_trashing
 #if !(defined(LIBAVFORMAT_BUILD) || defined(_FRAMEHOOK_H))
 #define printf please_use_av_log
 #define fprintf please_use_av_log