Update osxcross framework
Update osxcross framework

This is needed for the more recent llvm versions.

Also add `/usr/bin/file` into dependencies to remove a warning during build.

Signed-off-by: Justin Cormack <af64ee19f04db9509cb02b0e470e11e5402ef9b3@docker.com>

HuKeping/notary,endophage/notary,jfrazelle/notary,johnsandiford/notary,jfrazelle/notary,docker/notary,jfrazelle/notary,johnsandiford/notary,docker/notary,HuKeping/notary,docker/notary,HuKeping/notary,endophage/notary,endophage/notary,johnsandiford/notary