Add test for Khronos Group license and whitelist it.

third_party/devscripts/licensecheck.pl

 #!/usr/bin/perl -w
 # This script was originally based on the script of the same name from
 # the KDE SDK (by dfaure@kde.org)
 #
 # This version is
 #   Copyright (C) 2007, 2008 Adam D. Barratt
 #   Copyright (C) 2012 Francesco Poli
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ skipping 559 matching lines @@
     }
 
     if ($licensetext =~ /As a special exception, you may create a larger work that contains part or all of the Bison parser skeleton and distribute that work under terms of your choice/) {
         $license = $license . "with Bison parser exception";
     }
 
     if ($licensetext =~ /As a special exception to the GNU General Public License, if you distribute this file as part of a program or library that is built using GNU Libtool, you may include this file under the same distribution terms that you use for the rest of that program/) {
         $license = $license . "with libtool exception";
     }
 
+    if ($licensetext =~ /These materials are protected by copyright laws and contain material proprietary to the Khronos Group, Inc\. You may use these materials for implementing Khronos specifications, without altering or removing any trademark, copyright or other notice from the specification/) {
+        $license = $license . "Khronos Group";
+    }
+
     $license = "UNKNOWN" if (!length($license));
 
     # Remove trailing spaces.
     $license =~ s/\s+$//;
 
     return $license;
 }
 
 sub fatal($) {
     my ($pack,$file,$line);
     ($pack,$file,$line) = caller();
     (my $msg = "$progname: fatal error at line $line:\n@_\n") =~ tr/\0//d;
     $msg =~ s/\n\n$/\n/;
     die $msg;
 }