Merge topic 'linker-launcher'

ae108418ae Launchers: Support setting linker launchers
92c8b83641 cmNinjaNormalTargetGenerator: Fix "Language" rule variable
d93bfd95f8 Tests/CompilerLauncher: Fix file names and clarify comment

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6092