CTools build will now export things into an "Exports" directory.
Steve Revill authored
This replaces the "AcornC/C++.Libraries" directory that we had
before, which was a random mash-up of bits of a real "Exports"
directory.

Also reverted the CModule change - leave this job to components
to deal with in their own makefiles.

Version 6.58. Tagged as 'BuildSys-6_58'
1638c6ef