protocol/ArgParser: fix integer overflow in parse_range()
Casting std::numeric_limits<unsigned>::max() to "long" leads to an overflow if sizeof(unsigned)==sizeof(long), and the result will be -1. This happens on some 32 bit architectures, for example ARM and WIN32. Workaround: use std::numeric_limits<int>::max(), which is the largest signed integer. Since sizeof(long)>=sizeof(int), this will never overflow. Fixes Mantis ticket 0004080.
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Max Kellermann