Bind GL_NONE to buffers beyond the specified input count, and require a buffer count of one for the default framebuffer.

TRAC #22835

Signed-off-by: Geoff Lang
Signed-off-by: Shannon Woods
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@2039 736b8ea6-26fd-11df-bfd4-992fa37f6226