Enable bootstrapping SPM on Windows

[compnerd]

This requires that we get library building supported and get the ability to controls static and dynamic linking for various targets so that we can get a similar build to the CMake build.

[dschaefer2]

What do you mean by "bootstrapping"?

[compnerd]

This is an old issue, but it is meant to track building SPM with SPM itself, mostly for the purposes of ensuring that the SPM distribution is complete.