suppress tests failing on win7 cygwin

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on December 08, 2011 18:52:51_

on my laptop but apparently not on the win7 bots:

drmemory-cyg-dbg-32: 22 tests passed, ***\* 3 tests failed: ****
suppress => stderr failed to match (~~Dr.M~~ 6 user-suppressed leak(s)|~~Dr.M~~ 7
user-suppressed leak(s)), found ~~Dr.M~~ 5 user-suppressed leak(s)
instead
suppress-genoffs => stderr failed to match (~~Dr.M~~ 5 unique, 5 total, 48 byte(s) of
leak(s)|~~Dr.M~~ 4 unique, 4 total, 16 byte(s) of leak(s)), found
~~Dr.M~~ 3 unique, 3 total, 12 byte(s) of leak(s) instead
suppress-gensyms => stderr failed to match (~~Dr.M~~ 5 unique, 5 total, 48 byte(s) of
leak(s)|~~Dr.M~~ 4 unique, 4 total, 16 byte(s) of leak(s)), found
~~Dr.M~~ 3 unique, 3 total, 12 byte(s) of leak(s) instead

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=716_