tests/misc/recursive_iternext.py: Increase depth N from 1000 to 2000.

This makes the test reliably overflow the recursion limit (which is the
correct behaviour) on Mac OS X.

tests/misc/recursive_iternext.py

@@ -2,7 +2,7 @@
 
 try:
     [0] * 10000
-    N = 1000
+    N = 2000
 except:
     N = 100