use glow instead of gl_generator for GL/GLES bindings #185

Job	Run time
Run `rustfmt`	13s
Build (macos-latest, stable, default)	28s
Build (macos-latest, stable, --features 'chains sm-raw-window-handle-06', default)	18s
Build (macos-latest, stable, --features 'chains sm-raw-window-handle-05', default)	18s
Build (ubuntu-22.04, stable, default)	23s
Build (ubuntu-22.04, stable, --features 'chains sm-raw-window-handle-06', default)	30s
Build (ubuntu-22.04, stable, --features 'chains sm-raw-window-handle-05', default)	20s
Build (windows-latest, stable, default)	1m 18s
Build (windows-latest, stable, --features 'chains sm-raw-window-handle-06', default)	1m 55s
Build (windows-latest, stable, --features 'chains sm-raw-window-handle-05', default)	1m 34s
Build (ubuntu-22.04, --features 'sm-x11 sm-wayland-default', stable, default)	30s
Build (ubuntu-22.04, arm-linux-androideabi, stable)	29s
Build (windows-latest, --features 'chains sm-angle-builtin', stable, default)	7m 24s
Build (windows-latest, --features 'chains sm-no-wgl sm-angle-builtin', stable, default)	7m 25s
Build (windows-latest, aarch64-pc-windows-msvc, stable)	1m 40s
Build (ubuntu-22.04, aarch64-unknown-linux-ohos, stable)	27s
Result	1s
	25m 13s

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