Restore CI for `riscv64gc-unknown-linux-gnu` #860

Job	Run time
apidiff (aws-lc-sys, branch)	2m 7s
apidiff (aws-lc-sys, published)	2m 7s
clippy (aws-lc-rs, --features bindgen,unstable)	1m 17s
apidiff (aws-lc-fips-sys, branch)	2m 7s
clippy (aws-lc-rs, --features bindgen,unstable,fips)	1m 45s
apidiff (aws-lc-fips-sys, published)	2m 8s
apidiff (aws-lc-rs, branch)	2m 7s
clippy (aws-lc-rs, --no-default-features --features aws-lc-sys)	53s
apidiff (aws-lc-rs, published)	2m 8s
dependency-review	22s
rustfmt	30s
udeps	2m 8s
bindgen-dependency (ubuntu-latest)	21s
bindgen-fips-dependency (ubuntu-latest)	28s
bindgen-dependency (macos-12)	1s
bindgen-fips-dependency (macos-12)	1s
bindgen-dependency (macos-13-xlarge)	1s
bindgen-fips-dependency (macos-13-xlarge)	1s
bindgen-dependency (windows-latest)	43s
bindgen-fips-dependency (windows-latest)	1m 4s
copyright	4s
metadata-checks	35s
Resolve the dependencies to the minimum SemVer version	43s
mirai-analysis	2m 6s
semver-checks	1m 17s
	27m 4s

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