qt-5/modules/qtbase.nix: omit --host and --build configureFlags

QT's configure script doesn't understand these, so let's not pass them.

Co-authored-by: Sandro <sandro.jaeckel@gmail.com>

pkgs/development/libraries/qt-5/modules/qtbase.nix

@@ -209,6 +209,8 @@ stdenv.mkDerivation (finalAttrs: {
   # To prevent these failures, we need to override PostgreSQL detection.
   PSQL_LIBS = lib.optionalString (postgresql != null) "-L${postgresql.lib}/lib -lpq";
 
+  # do not pass --host and --build to configureFlags as QT's configure script doesn't understand them
+  configurePlatforms = [ ];
   # TODO Remove obsolete and useless flags once the build will be totally mastered
   configureFlags = [
     "-plugindir $(out)/$(qtPluginPrefix)"