python3Packages.dbus-python: remove explicit build-dir setting

`build-dir` is now set to `build` by default by the meson-python setup
hook.

pkgs/development/python-modules/dbus-python/default.nix

@@ -63,11 +63,6 @@ lib.fix (
       dbus-glib
     ];
 
-    pypaBuildFlags = [
-      # Don't discard meson build directory, still needed for tests!
-      "-Cbuild-dir=_meson-build"
-    ];
-
     mesonFlags = [ (lib.mesonBool "tests" finalPackage.doInstallCheck) ];
 
     # workaround bug in meson-python
@@ -87,7 +82,7 @@ lib.fix (
     checkPhase = ''
       runHook preCheck
 
-      meson test -C _meson-build --no-rebuild --print-errorlogs --timeout-multiplier 0
+      meson test -C build --no-rebuild --print-errorlogs --timeout-multiplier 0
 
       runHook postCheck
     '';