[libmultipath] remove unused KEEP_VEC define
[libmultipath] remove unused KEEP_VEC define

grzn/multipath-tools-explained,unakatsuo/multipath-tools,unakatsuo/multipath-tools,vijaychauhan/multipath-tools,gebi/multipath-tools,grzn/multipath-tools-explained,unakatsuo/multipath-tools,vijaychauhan/multipath-tools