Merge topic 'link-libs-config-case'

2af18704fd Merge branch 'backport-3.16-link-libs-config-case'
3f976bf201 target_link_libraries: Fix regression in case of $<CONFIG> genex
5a95b5e091 target_link_libraries: Fix regression in case of $<CONFIG> genex

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !4544