hedgeroid: adjust build.xml: fix app name; set java version; print hint if sdk build.xml is missing
[package]
name = "hedgewars-engine-messages"
version = "0.1.0"
authors = ["Andrey Korotaev <a.korotaev@hedgewars.org>"]
edition = "2018"
[dependencies]
nom = "4.1"
byteorder = "1.2"
queues = "1.1"