Mesa: tag core-context-v2: Support Desktop GL Core contexts

[Ian Romanick]

Module: Mesa
Branch: refs/tags/core-context-v2
Tag:    f3bc8c7fbc6b12124756c89fafc60ef75d0161d8
URL:    http://cgit.freedesktop.org/mesa/mesa/tag/?id=f3bc8c7fbc6b12124756c89fafc60ef75d0161d8

Tagger: Jordan Justen <jordan.l.justen at intel.com>
Date:   Tue Jul 24 16:02:14 2012 -0700

Support Desktop GL Core contexts

v2:
 * Decompose patches further
 * Drop DRI changes
 * Drop state_tracker changes
 * Drop MESA_GL_API_OVERRIDE variable

v1:
 * Add CORE API type
 * Alter code paths to generate errors for legacy functions
 * Add MESA_GL_API_OVERRIDE variable