Incorrect version of Ninja installed using PIP on M1

[nazar-pc]

Initially reported in ninja-build/ninja#2049

On Mac when using ARM CPU the binary installed with PIP contains x86-64 executable instead of arm64.

Initially discovered in conjunction with Meson build system in versatica/mediasoup#706 and can be tested by cloning that repo and doing npm i on Mac machine with M1 processor.

[mayeut]

The universal2 build seems to be broken since #70 (marked as universal2 but only contains an x86-64 binary).
Will provide a PR to fix this.