Use cstr literals where possible #139

Job	Run time
Run `rustfmt`	13s
Build (macos-latest, stable, default)	17s
Build (macos-latest, stable, --features 'chains sm-raw-window-handle-06', default)	23s
Build (macos-latest, stable, --features 'chains sm-raw-window-handle-05', default)	21s
Build (ubuntu-22.04, stable, default)	30s
Build (ubuntu-22.04, stable, --features 'chains sm-raw-window-handle-06', default)	37s
Build (ubuntu-22.04, stable, --features 'chains sm-raw-window-handle-05', default)	29s
Build (windows-latest, stable, default)	3m 2s
Build (windows-latest, stable, --features 'chains sm-raw-window-handle-06', default)	2m 30s
Build (windows-latest, stable, --features 'chains sm-raw-window-handle-05', default)	3m 5s
Build (ubuntu-22.04, --features 'sm-x11 sm-wayland-default', stable, default)	28s
Build (ubuntu-22.04, arm-linux-androideabi, stable)	31s
Build (windows-latest, --features 'chains sm-angle-builtin', stable, default)	7m 32s
Build (windows-latest, --features 'chains sm-no-wgl sm-angle-builtin', stable, default)	7m 29s
Build (windows-latest, aarch64-pc-windows-msvc, stable)	2m 6s
Build (ubuntu-22.04, aarch64-unknown-linux-ohos, stable)	31s
Result	2s
	30m 6s

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