Fix problems with upper-case in domain-match.

The domain-match rewrite didn't take into account
that domain names are case-insensitive, so things like

--address=/Example.com/.....

didn't work correctly.

src/dnsmasq.h

@@ -1376,6 +1376,7 @@ void safe_pipe(int *fd, int read_noblock);
 void *whine_malloc(size_t size);
 int sa_len(union mysockaddr *addr);
 int sockaddr_isequal(const union mysockaddr *s1, const union mysockaddr *s2);
+int hostname_order(const char *a, const char *b);
 int hostname_isequal(const char *a, const char *b);
 int hostname_issubdomain(char *a, char *b);
 time_t dnsmasq_time(void);