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Removes deprecated GL alpha test.

Description

Removes deprecated GL alpha test.

In GL3.0 alpha test mode was deprecated and removed in GL3.3. We should use discard/kill in shaders instead.
In shaders alpha test was removed in rP11477, in FFP it was removed with FFP in rP25283.

Differential Revision: https://code.wildfiregames.com/D4434