File extensions that should be ignored by the build.
This is a list of file extensions that may be part of a project for a given language but are not compiled.
© 2000–2016 Kitware, Inc.
© 2000–2011 Insight Software Consortium
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.5/variable/CMAKE_LANG_IGNORE_EXTENSIONS.html