SystemTools: CopyFileIfDifferent: Fix endless recursion

Issue: cmake/cmake#20347 (closed)

Reworked the change from !163 (merged) which was reverted in !165 (merged). This is now much more conservative and should not break existing behavior.

Topic-rename: SystemTools-CopyFileIfDifferent-recursion

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• 222cc909 - SystemTools: CopyFileIfDifferent: Fix endless recursion

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• 222cc909...9c970074 - 4 commits from branch utils:master
• 09ae5ce6 - SystemTools: CopyFileIfDifferent: Fix endless recursion

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@sebastianlipponer thanks. I updated your branch to rebase on master and make one tweak. Please fetch and reset your checkout.

Also please update testSystemTools.cxx with a case to cover the behavior that previously failed.

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• ea77593a - SystemTools: CopyFileIfDifferent: Fix endless recursion

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Thanks!

Do: stage

resolved all threads

assigned to @brad.king

Do: merge

merged

mentioned in commit 3e117fe1

mentioned in merge request cmake/cmake!4361 (merged)

mentioned in issue cmake/cmake#20347 (closed)