buildPythonPackage: add configurePhase, fixes #20926

I had removed the configurePhase in
https://github.com/NixOS/nixpkgs/pull/20894 because it was empty. This
seemed to break packages that use cmake.

pkgs/development/interpreters/python/build-python-package-common.nix

@@ -12,6 +12,11 @@
 attrs // {
   buildInputs = buildInputs ++ [ bootstrapped-pip ];
 
+  configurePhase = ''
+    runHook preConfigure
+    runHook postConfigure
+  '';
+
   installPhase = attrs.installPhase or ''
     runHook preInstall