math/py-numpy1: backport configtool/pkg-config file from numpy 2

Traditionally the way to query for the numpy C API has been through
distutils/setuptools, but the use of setuptools beyond a PEP-517
build backend is increasingly discouraged. numpy 2 introduced
numpy-config and a pkg-config file to allow consumer build systems
to better support the use of numpy as a dependency.

Based on: https://github.com/numpy/numpy/commit/2634f803313f349170c09606d3cc619accd72247

Reported by: fluffy
PR: 281470