Do not try to find swig.swg in host tree, fixes #0013449.
FindSWIG: mark SWIG_DIR & SWIG_VERSION as advanced.
Use CMAKE_CURRENT_LIST_DIR instead of CMAKE_ROOT, fixes #0013771
Merge topic 'FindSWIG-fix13426' into next

4417ac3 FindSWIG: mark SWIG_DIR & SWIG_VERSION as advanced.
Merge topic 'FindSWIG-fix13449' into next

2558357 Do not try to find swig.swg in host tree, fixes #0013449.
Merge topic 'FindSWIG-fix13771' into next

9d2437a Use CMAKE_CURRENT_LIST_DIR instead of CMAKE_ROOT, fixes #0013771