1.1 translator: WAR for GL_ALPHA_TEST_REF bug

Both the ATI and nVidia OpenGL drivers return the wrong answer on
glGetIntegerv(GL_ALPHA_TEST_REF). So Implement this functionality
in our code.

Change-Id: I022b1475f7edb9f1d0f48ebcaf9f6e9f5c4f344e
1 file changed