indexlib: add min_drawing_width() method
indexlib: add min_drawing_width() method

Signed-off-by: Thomas Petazzoni <a5d87d2bd7c424ee5cbdb4e978635bf653d5a005@enix.org>

maposmatic/ocitysmap,maposmatic/ocitysmap,dittaeva/ocitysmap,maposmatic/ocitysmap,dittaeva/ocitysmap