Merge topic 'export-name-safe-name'

142a85f9c1 cxxmodules: use filesystem-safe export names in filenames
4452d41488 cmGeneratorTarget: add method to get a filesystem-safe export name

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !9474