[v1.03] Add void to function declarations with no args. C99 Standard says in 6.7.5.3 that empty arguments are actually obsolescent - this commit fixes a warning in some compilers

src/x86/freq/freq_avx.c

@@ -10,7 +10,7 @@
 #include <stdint.h>
 #include "freq.h"
 
-void* compute_avx() {
+void* compute_avx(void) {
   bool end = false;
 
   struct timeval begin, now;