Correct glFramebufferRenderbuffer behavior for renderbuffer = 0.

TRAC #18388
ANGLEBUG=211
Signed-off-by: Daniel Koch
Author: Nicolas Capens

git-svn-id: https://angleproject.googlecode.com/svn/trunk@782 736b8ea6-26fd-11df-bfd4-992fa37f6226
3 files changed