Provide mkdssp binaries

[touwwouter]

We'll need to compile binaries for

• Linux
• Windows
• OSX10

Preferably with little dependencies.
Useful for https://github.com/cmbi/whatif/issues/42.

@jonblack Docker?

[jonblack]

This might be a bit of work. I've never cross-compiled using GNU autotools/make. It's possible, but I've always used CMake in the past.

Docker is useful for setting up a build environment.

I've taken a quick look at the libraries we depend on and as far as I know they are portable. libzeep is the only headache because it too also has no binary releases. I'm confident libzeep is portable though.

[touwwouter]

I've changed the issue so that it is only for mkdssp binaries. That removes the libzeep dependency anyway! Shall we discuss this in more detail in person (let's summarize important info here)?