Add libssl to Cross.toml #81

Job	Run time
create-release	8s
Build Pre-release Docker image / build-docker (arm64)	12m 51s
Build Pre-release Docker image / build-docker (amd64)	18m 56s
Build Release Docker image	0s
build-binaries (linux)	3m 2s
build-binaries (freebsd)	2m 38s
build-binaries (linux-arm64)	1m 10s
create-sbom	-1s
Build Pre-release Docker image / docker-manifest	1s
	38m 45s

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