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

[STINNER Victor]

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

> For the second, I don't understand why you want to
> compare the return result with RLIM_INFINITY:  PyInt_AsLong
> returns -1 to signal failure;  is there some guarantee that
> RLIM_INFINITY == -1 if it's defined?

rlim_t is an unsigned type. The idea of sign_warning_resource.patch 
was to make gcc quiet about signed/unsigned comparaisons.

RLIM_INFINITY is defined as (rlim_t)-1. But it looks that it's not 
clear, so I wrote another patch to fix the warnings.

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Added file: http://bugs.python.org/file13904/sign_warning_resource-2.patch

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