Merge topic 'msys'

5b941f33 SystemTools: Adapt permissions test to MSYS
f00dd83e SystemTools: Avoid unnecessary assumption of working directory in test case
17f4af9b SystemTools: Use octal base for error messages in permission test

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Ben Boeckel <ben.boeckel@kitware.com>
Merge-request: !211