Add a script to build the launcher without using Maven
Add a script to build the launcher without using Maven

This is very platform-specific, of course, and misses out on the Java part.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

This used to be revision r5431.

imagej/imagej-launcher,imagej/imagej-launcher,imagej/imagej-launcher