openvdb: fix build/install on secondary arch.
openvdb: fix build/install on secondary arch.

moochris/haikuports,haikuports/haikuports,moochris/haikuports,Begasus/haikuports,Begasus/haikuports,nielx/haikuports,haikuports/haikuports,haikuports/haikuports,Begasus/haikuports,haikuports/haikuports,haikuports/haikuports,nielx/haikuports,Begasus/haikuports,moochris/haikuports,Begasus/haikuports,nielx/haikuports