cmake@3 3.31.6 (new formula)

[Bronek]

This formula adds versioned formula cmake@3 (i.e. version 3), for projects which are not fully compatible with the current HEAD cmake release i.e. version 4

I know that the most recent cmake version 3 release is 3.31.7 rather than 3.31.6 which I used here - I based this formula on the existing commit 79832b2 . Obviously a version bump to 3.31.7 would be welcome, but perhaps someone else can deal with this.

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[p-linnane]

This has been previously rejected because CMake 3.x is not supported upstream: #218692