Merge topic 'LINKER_TYPE-mold-support'

801ae06952 LINKER_TYPE: Support MOLD only on GCC versions that support it
939ac5287e LINKER_TYPE: fix spelling error in message
922883782b LINKER_TYPE: Document that linker tool should be in the PATH

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !9334