OpenBSD Support

Changelog
- Remove github mirror buildscript
- Fixes Grovel FFI issues on OpenBSD
- Moving to Trunk-based Developmnt to keep everything simpler. The
  'develop' branch will be removed and 'master' is used for development
  instead of the latest release. Because ASDF specifies against using
  text suffixes in versions (e.g. 1.2.3-alpha or 1.2.3-dev), the master
  branch will borrow the version number of the latest release.

Code Coverage:

|Source File|Expression %|Branch %|
|-----------|------------|--------|
|shm.lisp   |60.3%       |90.6%   |