COMP: Fix centOS build of libpng to install in lib instead of lib64
COMP: Fix centOS build of libpng to install in lib instead of lib64

orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB