Set cmake requirement to 2.8.9 and use LINK_PRIVATE.
Set cmake requirement to 2.8.9 and use LINK_PRIVATE.

Hopefully this restores building it with an older CMake version.

muojp/heaptrack,muojp/heaptrack,muojp/heaptrack,stormspirit/heaptrack,muojp/heaptrack,stormspirit/heaptrack,muojp/heaptrack,stormspirit/heaptrack