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Add security audit to CI. #128

Job	Run time
Rust powerpc64-unknown-linux-gnu	1m 55s
Rust aarch64-linux-android	7m 6s
Rust s390x-unknown-linux-gnu	1m 59s
Rust arm-linux-androideabi	7m 38s
Rust i686-unknown-freebsd	1m 59s
Rust armv7-linux-androideabi	7m 28s
Rust x86_64-unknown-freebsd	1m 57s
Rust i686-linux-android	6m 2s
Rust x86_64-unknown-netbsd	1m 59s
Rust x86_64-linux-android	5m 23s
Rust mips-unknown-linux-gnu	1m 54s
Rust aarch64-unknown-linux-gnu	5m 59s
Rust mips64-unknown-linux-gnuabi64	1m 53s
Rust arm-unknown-linux-gnueabi	6m 8s
Rust mips64el-unknown-linux-gnuabi64	1m 56s
Rust armv7-unknown-linux-gnueabihf	6m 1s
Rust mipsel-unknown-linux-gnu	1m 54s
Rust i686-unknown-linux-gnu	4m 5s
Rust i686-unknown-linux-musl	4m 14s
Rust x86_64-unknown-linux-musl	3m 42s
Rust x86_64-pc-windows-gnu	5m 12s
	1h 26m 24s

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