use PATH_SUFFIXES to simplify find_* calls
Especially remove "lib64" when the given paths are all Unix ones and "lib" is also explicitely given. In that case CMake will search "lib64" anyway for platforms where it is known to make sense.
Especially remove "lib64" when the given paths are all Unix ones and "lib" is also explicitely given. In that case CMake will search "lib64" anyway for platforms where it is known to make sense.