Xcode: Fix erroneous MACOSX_BUNDLE link

Marc Chevrierrequested to merge
marc.chevrier/cmake:Link-MACOSX_BUNDLE into master

Refactoring in !6967 (merged) accidentally removed a GetParentDirectory call. Restore it.

Fixes: #23891 (closed)
Backport: release:HEAD^2

Edited by Brad King

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