Put license message on QINT

src/basic/math/bc9b.QINT.s

@@ -3,9 +3,13 @@
 ;; #LAYOUT# *   BASIC_0 #TAKE
 ;; #LAYOUT# *   *       #IGNORE
 
-;
+; This file is under the MIT license, it contains code released by Microsoft Corporation.
+; See LICENSE for more information.
+
 ; Math package - Quick conversion of FAC1 to 32 bit signed integer
 ;
+; This is verified to be identical to the original Microsoft implementation where it was named QINT.
+;
 ; Output:
 ; - $62-$65, big-endian order
 ;