The one we can reuse

Changes in 0.6.0:

• The Configure module now sets Configure.DebugBuild to either yes, no or
  empty value (default) in response to the configure script command line
  options --enable-debug and --disable-debug respectively.
• The Toolchain and Configure modules support Objective-C better: the OBJC
  environment variable is now recognized and remembered during configuration.
  Documentation is updated to reflect this.
• The Toolchain module adds -g to CFLAGS when Configure.DebugBuild is set
  to yes.
• ZMK self-tests are no longer looking into hidden directories when looking for
  unit tests. This notably fixes support for the Debian dgit tool which uses
  .git for storing local state that looks like the source tree.
• ZMK is now compliant with the REUSE toolkit.