SystemTools: Comment why ChangeDirectory does not use UNC for long paths

Issue: cmake/cmake#25936

assigned to @brad.king

mentioned in merge request cmake/cmake!10574 (merged)

closed

reopened

changed title from SystemTools: Fix ChangeDirectory for long paths on Windows to SystemTools: Comment why ChangeDirectory does not use UNC for long paths

added 1 commit

• d68a5d3f - SystemTools: Comment why ChangeDirectory does not use UNC for long paths

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resolved all threads

Do: stage

mentioned in issue cmake/cmake#25936

Do: merge

mentioned in commit 284a7281

merged manually