CMake Nightly Date Stamp
cmTarget: Clean up the InsertCompileDefinition implementation.

It accepts a before parameter but is never called with before=true.

compile definitions are sorted by std::set, so it wouldn't make sense
to allow user sorting.
Merge topic 'minor-cleanups' into next

dcd443d4 cmTarget: Clean up the InsertCompileDefinition implementation.
cd711ed0 CMake Nightly Date Stamp