Add an extra hint for assimp.
Add an extra hint for assimp.

If assimp has its own directory, e.g., ASSIMP_DIR=/opt/assimp/, then
this hint is needed.

sairajat/dealii,naliboff/dealii,naliboff/dealii,naliboff/dealii,sairajat/dealii,sairajat/dealii,naliboff/dealii,naliboff/dealii,sairajat/dealii,naliboff/dealii,sairajat/dealii,naliboff/dealii,sairajat/dealii,sairajat/dealii