[fixup]: extension_module: allow specifying install_dir OR subdir

mesonbuild/modules/python.py

@@ -35,7 +35,6 @@ from ..dependencies.base import (
 
 mod_kwargs = set(['subdir'])
 mod_kwargs.update(shlib_kwargs)
-mod_kwargs -= set(['install_dir', 'install_rpath'])
 
 
 def run_command(python, command):
@@ -245,6 +244,10 @@ class PythonHolder(ExternalProgramHolder, InterpreterObject):
         if 'name_suffix' in kwargs:
             raise mesonlib.MesonException('Name_suffix is set automatically, specifying it is forbidden.')
 
+        if 'subdir' in kwargs and 'install_dir' in kwargs:
+            raise InvalidArguments('"subdir" and "install_dir" are mutually exclusive')
+
+        if 'subdir' in kwargs:
             subdir = kwargs.pop('subdir', '')
             if not isinstance(subdir, str):
                 raise InvalidArguments('"subdir" argument must be a string.')