[issue5933] fix gcc -Wextra warnings (compare signed/unsigned)

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

About sign_warning_resource.patch: I don't know if RLIM_INFINITY 
constant is standard (always defined if getrlimit() is present).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5933>
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