Remove --no-entry flag when from dylink reversed tests. NFC (#25809)

These days this should never be necessary since we always link the main
module with the side module on the command line (so all symbol should be
visible, reversed or not).

Author: sbc100

test/test_core.py

@@ -4113,7 +4113,6 @@ def dylink_testf(self, main, side=None, expected=None, force_c=False, main_cflag
       side_ = side
       side = main
       main = side_
-      main_cflags += ['--no-entry']
     self.maybe_closure()
     # Same as dylink_test but takes source code as filenames on disc.
     old_args = self.cflags.copy()