Merge "Compile jsoncpp for Mac OS X" am: 412931e954 am: f62be7257b am: fb1d0dcd60 am: 1d5c303d7a am: bfcabbdf8b am: aaee24528d

Original change: https://android-review.googlesource.com/c/platform/external/jsoncpp/+/2629350

Change-Id: Ie75542799fe542081ba56d55909308a1c1769485
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>