Update cmake, simplify CXX version handling #8722
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CMake do this instead
opt out of the behavior for now, as we do
if (clang)
a bunch.Seen a few diffs recently where people can't use some specific part of C++17 - hopefully this fixes it,
as well as making future updates simpler.
I set the cmake minimum version to the minimum version that has CMAKE_CXX_STANDARD in it, which is older
than anything we support, but given that updating that changes cmake's behavior, trying to keep it as small
as possible for this diff.