Report gl_MaxDrawBuffers as 1 when the MRT extension is disabled, and the implementation value otherwise.

TRAC #22888

Signed-off-by: Nicolas Capens
Signed-off-by: Shannon Woods
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@2050 736b8ea6-26fd-11df-bfd4-992fa37f6226
3 files changed