pkg/ccn-lite: check for minimal cmake version

ccn-lite does not build with cmake < 3.6.0. This checks for a minimal version
instead of failing to compile.

    cmake version 3.5.2 is not >= to minimal required 3.6.0

    Makefile:25: recipe for target '..cmake_version_supported' failed

Tested with versions 3.5.2, 3.6.0-rc1, 3.6.0, 3.6.3, 3.7.0-rc1, 3.7.0.

Note: the check used does not consider '-rcX' as 'sort -V' does not handle them
properly.