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MSVC: Revert "Default to -ZI instead of /Zi for x86 and x64"

Brad King requested to merge brad.king/cmake:revert-msvc-compilers-default-to-ZI into master

Revert !7295 (merged). The -ZI flag is incompatible with the -GL flag used for IPO, and so is not an unconditionally better default. Revert the change pending future design of a first-class setting for MSVC debug info format that can be automatically reconciled with IPO settings.

That commit introduced policy CMP0138, but we already have later policy numbers used too. Leave placeholder text to avoid policy renumbering.

Issue: #23607 (closed), #10189 (closed)
Backport: release

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