[Bug 782376] glmemory: Only use glDrawBuffer if available

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782376

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 351413
  --> https://bugzilla.gnome.org/attachment.cgi?id=351413&action=edit
glmemory: Only use glDrawBuffer if available

Otherwise fall back to glDrawBuffers. Also check if glReadBuffer exists
before using it.

glDrawBuffer does not exist for GLES, only glDrawBuffers does.

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