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The `CMAKE_{EXE,SHARED,MODULE,STATIC}_LINKER_FLAGS` variables are
not language-specific, so multiple languages' toolchains may disagree
about if/how to pass the flag through a compiler driver to the linker.
Furthermore, carrying the flag in public-facing variables allows projects
or users to change it even though it is required. Add policy CMP0197
to remove the flag from the public-facing variables and generate it
automatically instead:
* For command-line generators, add the `-machine:` flag to the
linker and archiver rule variables.
* For Visual Studio generators, we do not need to explicitly add the
link `-machine:` flag. MSBuild automatically adds it, and the new
behavior actually removes a duplicate we generated previously.
Issue: #21934