Add root usd library directory to build arguments, same as other libraries. Also fix error/typo in compile_USD regarding _is_building. Reviewed By: mont29 Differential Revision: https://developer.blender.org/D7563
Add root usd library directory to build arguments, same as other libraries. Also fix error/typo in compile_USD regarding _is_building. Reviewed By: mont29 Differential Revision: https://developer.blender.org/D7563