Can't build a static executable

[secinthenet]

Static executables are great for easy deployment in air gapped machines, like a laptop running Tails, so I think they should be supported, if not the default.
I tried to build using something like CFLAGS="-static" CXXFLAGS="-static" LDFLAGS="-static" ./build.sh, but it fails because libgcc_s.a doesn't exist, only libgcc_s.so.

[wolfmcnally]

@gorazdko I believe this has to do with Linux builds, would you comment on this?

[wolfmcnally]

@secinthenet Would you care to submit a PR?

[secinthenet]

I don't know how to fix this, I'll need to dig into this