tes-gs-max-output: Require GL_ARB_gpu_shader5 to get max GS invocations
GL_MAX_GEOMETRY_SHADER_INVOCATIONS
doesn't exist in GL3.2 only with
GL_ARB_gpu_shader5
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GL_MAX_GEOMETRY_SHADER_INVOCATIONS
doesn't exist in GL3.2 only with
GL_ARB_gpu_shader5