EGL_KHR_context_flush_control
https://www.khronos.org/registry/egl/specs/eglspec.1.5.pdf
EGL_KHR_context_flush_control

	EGL_CONTEXT_RELEASE_BEHAVIOR_NONE_KHR 0
	EGL_CONTEXT_RELEASE_BEHAVIOR_KHR 0x2097
	EGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_KHR 0x2098