freeglut 3.2.2
Changes
* Fix netbsd/aarch64 build by including sys/joystick.h instead of
machine/joystick.h.
* Fix build with gcc >= 10 which made -fno-common the default by no
longer relying on COMMON symbols for globals.
* Fix android build (default to FREEGLUT_GLES, and check for debug
flags).
* Add flat shading option to the shapes demo.
* Fix crash when calling primitive drawing functions without creating a
window first.
* Dropped really old and unmaintained doc directory from the source
tree.
52b6dc4f67