Bug 530280: Build with SDK 10.10 on the Foundation mac machine (10.12)

Check if MacOSX 10.10 SDK exists at SDKROOT_PATH before exporting it.
So that local build doesn't fail.

Change-Id: Ifcf4fec7d2733d25c9cb983be15540ea5b513a53
Signed-off-by: Lakshmi Shanmugam <lshanmug@in.ibm.com>
1 file changed