Use cstr literals where possible #133

Job	Run time
Run `rustfmt`	13s
Build (macos-latest, stable, default)	17s
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)	21s
Build (ubuntu-22.04, stable, --features 'chains sm-raw-window-handle-06', default)	20s
Build (ubuntu-22.04, stable, --features 'chains sm-raw-window-handle-05', default)	21s
Build (windows-latest, stable, default)	3m 52s
Build (windows-latest, stable, --features 'chains sm-raw-window-handle-06', default)	2m 14s
Build (windows-latest, stable, --features 'chains sm-raw-window-handle-05', default)	3m 55s
Build (ubuntu-22.04, --features 'sm-x11 sm-wayland-default', stable, default)	35s
Build (ubuntu-22.04, arm-linux-androideabi, stable)	21s
Build (windows-latest, --features 'chains sm-angle-builtin', stable, default)	8m 2s
Build (windows-latest, --features 'chains sm-no-wgl sm-angle-builtin', stable, default)	8m 10s
Build (windows-latest, aarch64-pc-windows-msvc, stable)	2m 44s
Build (ubuntu-22.04, aarch64-unknown-linux-ohos, stable)	30s
Result	1s
	32m 32s

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