Compilation based on make and bash does not work on Windows

[Whil-]

The compilation process that is set up using make and bash does not work well with windows. Relying on make and bash-scripts for compilation as is done in radian-byte-compile will break in 99% of windows users configurations. Either it should only be active on non-windows machines or some kind of conditional logic is needed to determine how to do the external compilation.

This was mentioned in issue #457 as well, but extracted here for "issue-atomicity". ;)