Fix for #71745: FILTER_FLAG_NO_RES_RANGE does not cover whole 127.0.0.0/8 #1794
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This fixes filter_var to recognize whole 127.0.0.0/8 range as reserved.
Note that there is more of the reserved ranges missing as per [1] & [2], but it's rather a feature request. (I'll send another separate PR for those later if needed.)
[1] https://en.wikipedia.org/wiki/Reserved_IP_addresses#IPv4
[2] https://www.wikiwand.com/en/Reserved_IP_addresses