Allow external bindgen for fips; more prefixing; bump aws-lc-fips-sys to v0.12.8 #369

Job	Run time
apidiff (aws-lc-sys, branch)	3m 41s
apidiff (aws-lc-sys, published)	2m 34s
apidiff (aws-lc-fips-sys, branch)	2m 47s
apidiff (aws-lc-fips-sys, published)	2m 56s
bindgen-dependency (ubuntu-latest)	23s
apidiff (aws-lc-rs, branch)	2m 18s
bindgen-dependency (macos-12)	55s
apidiff (aws-lc-rs, published)	2m 32s
bindgen-dependency (macos-13-xlarge)	26s
bindgen-dependency (windows-latest)	41s
clippy (aws-lc-rs, --features bindgen,unstable)	1m 4s
dependency-review	16s
clippy (aws-lc-rs, --features bindgen,unstable,fips)	1m 21s
rustfmt	26s
clippy (aws-lc-rs, --no-default-features --features aws-lc-sys)	54s
udeps	7m 30s
copyright	3s
bindgen-fips-dependency (ubuntu-latest)	16s
bindgen-fips-dependency (macos-12)	32s
Resolve the dependencies to the minimum SemVer version	44s
mirai-analysis	3m 13s
bindgen-fips-dependency (macos-13-xlarge)	28s
bindgen-fips-dependency (windows-latest)	48s
semver-checks	3m 35s
	40m 23s

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