Add libssl1.0 to Ubuntu 18 runtime libraries

[techmccat]

Closes #179

Fixes VA-11 Hall-A (and probably other GameMaker Studio 1 games) not starting on new installs that don't have the old steam runtime

[strycore]

Have you tested this?

[strycore]

By tested, I mean have you run runtime/build.sh

[techmccat]

As far as I've seen the runtime build process isn't documented, I ran it now in a Ubuntu 18.04 container after installing sudo, lsb-release and adding i386 packages

It seems the new files are in both of the Ubuntu-18.04 directories, pointing LD_LIBRARY_PATH to the i386 one has the game run fine
The x86-64 directory is the only one that gets made into a tarball, but that looks like an issue with the build script

[strycore]

Our immediate goal is to abandon the 18.04 runtime and switch everything to Pressure Vessel so I'm not sure how useful it is to keep feeding its corpse.

[techmccat]

Which libraries would go into the pressure vessel containers then?
Because unfortunately I suspect there are going to be a few games needing libssl1.0, since it was included in the original steam linux runtime

[strycore]

Pressure Vessel is built by Valve so we don't control what goes in it. We can likely add compatibility modes for Steam Runtime V1 and V2.

But ideally, the preferred method would be to add required libs for a game as metadata so we can pull those libs automatically and create a lib32 or lib64 folder in the game folder.