Enable doctests of cdef functions

Author: jdemeyer

cypari2/handle_error.pyx

@@ -145,7 +145,6 @@ cdef void _pari_init_error_handling():
     Warnings still work just like in GP::
 
     >>> pari('warning("test")')
-      ***   user warning: test
     """
     global cb_pari_err_handle
     global cb_pari_err_recover

setup.py

@@ -49,7 +49,10 @@ def finalize_options(self):
         # Generate auto-generated sources from pari.desc
         rebuild()
 
-        self.directives = dict(binding=True)
+        self.directives = {
+            "autotestdict.cdef": True,
+            "binding": True,
+        }
 
         self.distribution.ext_modules[:] = cythonize(
             self.distribution.ext_modules,