Rollup merge of #81259 - est31:cfg_version, r=petrochenkov

Replace version_check dependency with own version parsing code

This gives compiler maintainers a better degree of control
over how the version gets parsed and is a good way to ensure
that there are no changes of behaviour in the future.

Also, issue a warning if the version is invalid instead of erroring
so that we stay forwards compatible with possible future changes
of the versioning scheme.

Last, this improves the present test a little.

Fixes #79436

r? `@petrochenkov`

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