tests/assert-msg-test: it is not a script (anymore?)

Fixes running the program on win32.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>

glib/tests/assert-msg-test.py

@@ -74,10 +74,6 @@ class TestAssertMessage(unittest.TestCase):
 
     def runAssertMessage(self, *args):
         argv = [self.__assert_msg_test]
-        # shebang lines are not supported on native
-        # Windows consoles
-        if os.name == "nt":
-            argv.insert(0, sys.executable)
         argv.extend(args)
         print("Running:", argv)