Merge topic 'target-system-variables'

e4c53cdc15 BinUtils: Drop now-unnecessary cross-compiling workaround for Apple hosts
1373373823 enable_language: Establish target platform identification variables earlier
1d916bf3d2 kFreeBSD,GNU: Provide multiarch library directory regex earlier

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Ben Boeckel <ben.boeckel@kitware.com>
Merge-request: !8544