test-demandimport.py: PyPy support

The stringification of sys.stderr is different in PyPy:

$ pypy -c 'import sys; print sys.stderr'
<open file '<fdopen>', mode 'w' at 0x00a42080>

$ python -c 'import sys; print sys.stderr'
<open file '<stderr>', mode 'w' at 0x10025a270>

The test will now ignore the exact value between the angle brackets.

tests/test-demandimport.py

@@ -8,6 +8,7 b' def f(obj):'
     l = repr(obj)
     l = rsub("0x[0-9a-fA-F]+", "0x?", l)
     l = rsub("from '.*'", "from '?'", l)
+    l = rsub("'<[a-z]*>'", "'<whatever>'", l)
     return l
 
 import os

tests/test-demandimport.py.out

@@ -11,5 +11,5 b" fred = <unloaded module 're'>"
 fred.sub = <function sub at 0x?>
 fred = <proxied module 're'>
 re = <unloaded module 'sys'>
-re.stderr = <open file '<stderr>', mode 'w' at 0x?>
+re.stderr = <open file '<whatever>', mode 'w' at 0x?>
 re = <proxied module 'sys'>