buildroot

libmaxminddb: improve --disable-tests patch

Following review of libmaxminddb patch by Thomas Petazzoni, here is an
enhanced version of the --disable-tests patch which has been sent
upstream.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>