jogl-utils mostly compile clean

jogl-utils <https://jogamp.org/cgit/jogl-utils.git/>
is now mostly compile clean, see
<https://jogamp.org/cgit/jogl-utils.git/commit/?id=332dd8550a2301427dd942d2a77cb59ebd3ec92e>

One demo needs more love, i.e. adding vecmath jar to libs
or replacing it w/ float[] code.

Other changes like old shader-ARB should be reviewed
and dropped altogether, I simply did an integer cast.

Just thought it is a good idea to repair this project,
being a good janitor again :)

~Sven