Last porting rc

This only changes in this release are to fix compiler warnings in
NetBSD and OpenBSD.

Merge pull request UpstandingHackers#97 from thequux/freebsd

Made mono tool only get loaded when the dotnet bindings are getting built

Merge pull request UpstandingHackers#94 from pesco/fix-49-stringmap-s…

…egfault

Fix UpstandingHackers#49 stringmap segfault