Andrew Kelley 56129d26eb cmake: build stage3 by default
This is a simplification of the cmake build script which introduces a
new "stage3" target that is built by default, which builds and installs
a stage3 zig.

It greatly simplifies the build instructions for Zig, making it conform
to the regular cmake routine, while still producing a stage3 artifact.
2022-08-28 17:07:21 -07:00
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