Fix mixup in test

test_fp_mode called get_fpexc. This failed in architectures which
support get_fpexc but not get_fp_mode.

Author: WhyNotHugo

test_prctl.py

@@ -170,8 +170,8 @@ def test_fp_mode(self):
             self.assertEqual(prctl.get_fp_mode(), prctl.FP_MODE_FRE)
             self.assertRaises(ValueError, prctl.set_fp_mode, 999)
         else:
-            self.assertRaises(OSError, prctl.get_fpexc)
-            self.assertRaises(OSError, prctl.set_fpexc)
+            self.assertRaises(OSError, prctl.get_fp_mode)
+            self.assertRaises(ValueError, prctl.set_fp_mode)
 
     @require('set_io_flusher')
     def test_io_flusher(self):