drawing range updater update and myrand() (but not usage of it)

src/utility.cpp

@@ -88,4 +88,18 @@ const v3s16 g_26dirs[26] =
 	// 26
 };
 
+static unsigned long next = 1;
+
+/* RAND_MAX assumed to be 32767 */
+int myrand(void)
+{
+   next = next * 1103515245 + 12345;
+   return((unsigned)(next/65536) % 32768);
+}
+
+void mysrand(unsigned seed)
+{
+   next = seed;
+}
+