Can't be used by default as [pkgconfig doesn't do well when `${pcfiledir}` becomes `/usr`](https://discuss.python.org/t/making-the-default-cpython-build-more-relocatable/109937/4). This is why it's [a flag in Meson to use](https://mesonbuild.com/Builtin-options.html#pkgconfig-module).
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