GL_ARB_parallel_shader_compile
http://www.opengl.org/registry/specs/ARB/parallel_shader_compile.txt
GL_ARB_parallel_shader_compile
	GL_MAX_SHADER_COMPILER_THREADS_ARB 0x91B0
	GL_COMPLETION_STATUS_ARB 0x91B1
	void glMaxShaderCompilerThreadsARB (GLuint count)
