Replace getquad() with inet_pton()
getquad() was implemented back in 2001 to warn about IPv4 addresses in non-dotted-quad form being used. As change 4900 (GL #13) removed all uses of inet_aton(), which allowed such forms, with inet_pton(), which does not allow them, there is no point in keeping getquad() around as it now only prints an extra warning when the parser comes across an IP address in a form which is not acceptable anyway. Replace all uses of getquad() with inet_pton(AF_INET, ...).
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