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, ...).