cmake : bump to version 3.0.2

The
cmake-0001-FindQt4-do-not-prepend-CMake-root-path-when-searchin.patch
patch has been merged upstream as part of commit
e8b8b37ef6fef094940d3384df5a1d421b9fa568.

[Thomas: tweak commit log by adding details about the patch being
removed.]

Signed-off-by: Jérémy Rosen <jeremy.rosen@openwide.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>