Merge topic 'depfile-parsing-update'

0b65a2b253 add_custom_command(DEPFILE): ensure all dependencies are taken into account
e04a352cca Depfile parsing: enhance compatibility with GNU Make

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !6861