cmake: fix cmake_policy
set (SWIG_COMPILE_FLAGS "-Wno-shadow -Wno-old-style-cast -Wno-unused-variable")
-# TODO change once new is supported on debian
-cmake_policy (SET CMP0078 OLD)
find_swig ()
if (NOT SWIG_FOUND)
exclude_binding (swig "neither swig2/3 found. Please install swig3.0 and set -DSWIG_EXECUTABLE=")
