Use macro for randomization with ISO value

include/random.h

@@ -10,6 +10,9 @@ u16 Random2(void);
 
 //Returns a 32-bit pseudorandom number
 #define Random32() (Random() | (Random() << 16))
+
+// The number 1103515245 comes from the example implementation of rand and srand
+// in the ISO C standard.
 #define ISO_RANDOMIZE1(val)(1103515245 * (val) + 24691)
 #define ISO_RANDOMIZE2(val)(1103515245 * (val) + 12345)