[CMake] Do not set CMP0116 explicitly to old

[boomanaiden154]

CMP0116 was originally set to old to get rid of warnings. However, this behavior is now set to new by default with the minimum CMake version that LLVM requires so does not produce any warnings, and setting it explicitly to old does produce a warning in newer CMake versions. Due to these reasons, remove this check for now.

Splitting off from removing the CMP0114 check just in case something breaks.

Partially fixes #83727.

[zero9178]

Last I checked, setting this to new causes issues with cmake consuming TableGens dep files. I don't fully remember the sympton but I think it'd either claim that a TableGen command is always out of date or it would not capture all dependencies and therefore not rereun a TableGen command if an included file changed.

There was a PR that would address this here #72333. Is this still needed/the case?

[boomanaiden154]

Last I checked, setting this to new causes issues with cmake consuming TableGens dep files. I don't fully remember the sympton but I think it'd either claim that a TableGen command is always out of date or it would not capture all dependencies and therefore not rereun a TableGen command if an included file changed.

There was a PR that would address this here #72333. Is this still needed/the case?

Looks like it's still needed. I didn't realize this was an issue. Thanks for bringing this up! I'll make sure that gets fixed before we merge this/merge this as part of the fix.