Genex: Add $<LINK_LANGUAGE:...> and $<LINK_LANG_AND_ID:...>

Marc Chevrierrequested to merge
marc.chevrier/cmake:Genex-LINK_LANGUAGE into master

This MR may help to solve issues #19757 and #18008 (closed)

Fixes: #19965 (closed)

Edited by Marc Chevrier

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