Rust

Add comment on removing build script. #43

Job	Run time
Rust	26s
Miri	38s
Rust (ubuntu-latest, x86_64, stable)	1m 31s
Rust (1.60.0)	1m 10s
Rust (ubuntu-latest, x86_64, beta)	22s
Rust (1.63.0)	1m 10s
Rust (ubuntu-latest, x86_64, nightly)	18s
Rust (1.66.0)	1m 13s
Rust (ubuntu-latest, x86_64, 1.70.0)	25s
Rust (1.69.0)	15s
Rust (1.70.0)	17s
Rust (ubuntu-latest, i686, stable)	6s
Rust (ubuntu-latest, i686, beta)	21s
Rust (ubuntu-latest, i686, nightly)	16s
Rust (ubuntu-latest, i686, 1.70.0)	16s
Rust (ubuntu-latest, aarch64, stable)	29s
Rust (ubuntu-latest, aarch64, beta)	13s
Rust (ubuntu-latest, aarch64, nightly)	14s
Rust (ubuntu-latest, aarch64, 1.70.0)	16s
Rust (windows-latest, x86_64, stable)	1m 56s
Rust (windows-latest, x86_64, beta)	42s
Rust (windows-latest, x86_64, nightly)	46s
Rust (windows-latest, x86_64, 1.70.0)	57s
Rust (windows-latest, i686, stable)	1m 11s
Rust (windows-latest, i686, beta)	29s
Rust (windows-latest, i686, nightly)	27s
Rust (windows-latest, i686, 1.70.0)	34s
Rust (windows-latest, aarch64, stable)	1m 17s
Rust (windows-latest, aarch64, beta)	30s
Rust (windows-latest, aarch64, nightly)	35s
Rust (windows-latest, aarch64, 1.70.0)	28s
	19m 48s

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