Use cmake --build instead of make -C

On my system, Ubuntu 24.04 image with CMake 3.28.3, the cmake config
defaults to the ninja generator, leading to an error in
`pip install -e .` because no `Makefile` is generated. Instead, we can
use cmake to do the build as well using `cmake --build <build_dir>`
which will call whatever tool matches the default generator.

Author: jacobhinkle

setup.py

@@ -34,7 +34,7 @@ def _make(self, build_dir: str, build_type: str, parallel: int):
                         f"/p:Configuration={build_type}",
                         "/t:_cext"])
         else:
-            self.spawn(["make", "-C", build_dir, "-j", str(parallel)])
+            self.spawn(["cmake", "--build", build_dir, "-j", str(parallel)])
         # TODO: ideally, we should "make install" the library somewhere, so that CMake removes
         #   any build RPATHs etc. But I'll leave that for another day.