BUILD: Fix a typo in inotify.m4
This typo prevented HAVE_INOTIFY from ever being set and as an effect,
prevented /etc/resolv.conf inotify detection from working
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>
Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>