package/opencv3: disable explicitly lapack support

lapack support is enabled by default but the opencv3.mk doesn't handle
this dependency yet.

Fixes:
http://autobuild.buildroot.net/results/c8a/c8a25af38c405594722b44aef34e5e4c549639db



Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>