Successfully compiles dev-lang/julia on Gentoo and Sabayon

There were changes in the official julialang repo: "external" was named to "deps".
Julia is still not easy to install, when you don't fullfill the dependencies as you stated.
However I'd to contribute this fix. Please tell me if it works for you.

There are some minor bugs, in the official launchers and nginx.conf remaining.
See: /usr/bin/launch-julia-webserver and /usr/etc/nginx.conf