Merge topic 'CPATH_symlinks'

c00f928ce1 Do not exclude include directory symlinks to entries of CPATH
5c02964aff cmLocalGenerator: Simplify CPATH lookup loop
86595b3002 cmLocalGenerator: Clarify check for membership in multiple sets
10969fd003 cmLocalGenerator: Remove unnecessary parentheses in a condition
3fd56472c6 cmLocalGenerator: Store realpath lookup result in a variable
429fb28f25 cmLocalGenerator: Factor out repeated condition into local variable

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6313