For windows compile, moved definve of va_copy

common/MiscFunctions.cpp

@@ -56,10 +56,6 @@ using namespace std;
 	#include <errno.h>
 #endif
 
-#ifndef va_copy
-	#define va_copy(d,s) ((d) = (s))
-#endif
-
 static bool WELLRNG_init = false;
 static int state_i = 0;
 static unsigned int STATE[R];

common/StringUtil.cpp

@@ -30,6 +30,9 @@
 	#include <stdlib.h>
 #endif
 
+#ifndef va_copy
+	#define va_copy(d,s) ((d) = (s))
+#endif
 
 // original source: 
 // https://github.com/facebook/folly/blob/master/folly/String.cpp