buildroot

Revert "package/cmake: bump version to 3.10.0 and add license hash"

This reverts commit 65205c2425bccb7039ca0e2caffb7c64c26805f7, which
causes too many build failures of host-cmake due to the use by CMake
of the emplace_hint C++11 method.

Fixes:

  http://autobuild.buildroot.net/results/90d38169b50c29842ecc1752c2abf66d4c2d9e63/

This new dependency of host-cmake will have to be taken care of in a
more complete patch.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>