Change various types to the correct signedness to avoid warnings.

Also cast the check of "inet_addr" to guint32. The POSIX declaration
of this function returns in_addr_t which is the same as uint32_t.
Windows does not define this type and instead uses unsigned long.

src/common/util.c

@@ -988,7 +988,7 @@ void
 country_search (char *pattern, void *ud, void (*print)(void *, char *, ...))
 {
 	const domain_t *dom;
-	int i;
+	size_t i;
 
 	for (i = 0; i < sizeof (domain) / sizeof (domain_t); i++)
 	{