zmsg_types.h: add ctor for bool_img
zmsg_types.h: add ctor for bool_img

Signed-off-by: Yi Qingliang <36380975b124e1c123f6f25e4b18a8f5e5597b95@tom.com>

walkthetalk/libem,walkthetalk/libem,walkthetalk/libem