Description:
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AIX's built-in inet_pton function is less strict than Linux's inet_pton function : it accepts IP strings containing excedentary O before one of the fourth integers.

To ensure consistent behaviour on the two OS, I suggest to check for excendentary O when using PHP's inet_pton on AIX and return false if they exist. This can easily be done by converting back the integer IP returned by AIX's inet_pton to a string IP and check if it is the same as the initial string. This is implemented in the attached patch (tested with PHP 7.0.3, 7.0.7, 7.0.9 and 7.0.10 on AIX 6.1).

If consistency is not a priority, this test should be skipped when running on AIX.