Merge topic 'ci-mingw'

3624295c9b ci: add MSYS Makefiles nightly CI job
01c58daec7 ci: add MinGW Makefiles nightly CI job
88b14c5cf4 Tests: Improve GeneratorExpression SHELL_PATH case robustness on MSYS 1.0
82c990e9be Tests: Improve RunCMake.GetPrerequisites sample executable selection

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !7861