Minor update to build script.
Minor update to build script.

qiuwch/unrealcv,qiuwch/unrealcv,unrealcv/unrealcv,unrealcv/unrealcv,qiuwch/unrealcv,unrealcv/unrealcv,qiuwch/unrealcv,unrealcv/unrealcv,unrealcv/unrealcv,qiuwch/unrealcv,qiuwch/unrealcv