[issue2422] Automatically disable pymalloc when running under valgrind

[James Henstridge]

James Henstridge <james at jamesh.id.au> added the comment:

An updated version of the patch.  The previous ones were missing the
valgrind check, resulting in the pymalloc code paths being executed
(which in turn cause unintialised read warnings from valgrind).

Added file: http://bugs.python.org/file9872/disable-pymalloc-on-valgrind-py26.patch

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