cmake ESBTL examples

liminchen/OptCuts ext/libigl/external/cgal/src/CGAL_Project/examples/Skin_surface_3/CMakeLists.txt :32 

find_package(ESBTL)

CGAL/cgal Skin_surface_3/examples/Skin_surface_3/CMakeLists.txt :24 

find_package(ESBTL QUIET)