ASACORE-968: Update minimum OSX version

Bumping required OSX version to 10.8.5. Should be set to 10.9.x after
release branch is cut.

Change-Id: Id6e5957ce4b866e6ddf3df4d95ff6ade7cc48ece
Signed-off-by: Ry Jones <c_lawren@qce.qualcomm.com>