fipsified GLFW (https://github.com/glfw/glfw)
fips build system: https://github.com/floooh/fips
NOTE 29-Oct-2017
On MacOS, GLFW now defaults to HighDPI rendering on Retina displays.
To get the old behaviour, set the GLFW_COCOA_RETINA_FRAMEBUFFER
window hint to GLFW_FALSE.
Oryol does this automatically.
