* (bug 3019) use the operating system's random number generator if possible

when generating the qkey file

code/qcommon/md5.c

@@ -263,7 +263,7 @@ char *Com_MD5File( const char *fn, int length, const char *prefix, int prefix_le
 	unsigned char digest[16] = {""}; 
 	fileHandle_t f;
 	MD5_CTX md5;
-	char buffer[2048];
+	byte buffer[2048];
 	int i;
 	int filelen = 0;
 	int r = 0;
@@ -296,7 +296,7 @@ char *Com_MD5File( const char *fn, int length, const char *prefix, int prefix_le
 		if(r + total > length)
 			r = length - total;
 		total += r;
-		MD5Update(&md5 , (unsigned char *)buffer, r);
+		MD5Update(&md5 , buffer, r);
 		if(r < sizeof(buffer) || total >= length)
 			break;
 	}