source_group: Fix regression in relative FILES (!3630) · Merge requests · CMake / CMake · GitLab

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Brad King requested to merge brad.king/cmake:source_group-tree-files into master Jul 30, 2019

Fix the check added in !3265 (merged) to convert to an absolute path before checking for existence.

Also simplify the conversion to an absolute path.

Fixes: #19454 (closed)