Fix license metadata for mesa

third_party/mesa/README.chromium

 Name: mesa
 Version: 7.9
 URL: http://www.mesa3d.org/
-License File: MesaLib/docs/COPYING
+License: MIT and LGPL v2
 Security Critical: Yes
 
 Description:
 This directory contains a copy of these MesaLib components:
 
 Main Mesa code    src/mesa/
 Device drivers    src/mesa/drivers/*
 Ext headers       include/GL/glext.h
                   include/GL/glxext.h
 SGI GLU library   src/glu/sgi/
 
-The license is in MesaLib/docs/license.html.
- 
+The license file in this directory is derived from MesaLib/docs/license.html
+and MesaLib/docs/COPYING.
+
 Modifications made with initial commit:
 - Converted to utf-8 with: vim +"argdo write ++enc=utf-8" *.c
 
 - Added the file README.chromium (this file)
 
 Later modifications (see chromium.patch):
 - Added OSMesaGetProcAddress to MesaLib/src/mesa/drivers/osmesa/osmesa.def
 
 - Added #pragma optimize('', off) to:
   - MesaLib\src\mesa\main\histogram.c
@@ skipping 71 matching lines @@
 - Merged fix for https://bugs.freedesktop.org/show_bug.cgi?id=51574
   (commit b1802a2115323233352da558430e109ff187b8af)
 
 - Merged the replacement of memcpy() with memmove() in SHIFT_ARRAY declared in
   s_span.c (commit a44d715d2b19dc2f8f48b01144cc38e4e2c5015a)
 
 - Suppressed the OOB read reported by AddressSanitizer in swizzle_for_size from
   ir_to_mesa.cpp
   https://code.google.com/p/chromium/issues/detail?id=139772
   https://bugs.freedesktop.org/show_bug.cgi?id=52996