Bug#539315: executable-not-elf-or-script test should know about jars

[Wookey <wookey01@arm.com>]

The lintian test executable-not-elf-or-script comes up with false
positives for every properly-packaged java app in Debian because those
have executable .jar files (pointed to by a link in /usr/bin). This is
what javahelper makes for you automatically, so it's slightly galling
to be told by lintian that it's not right.

This affects two of my packages.

Can we teach this test that .jars are valid executables like elf files
and things with shebang lines?

Or is there some reason why that's a bad plan?

Alternatively we should teach javahelper to automatically put in a lintian override
to supress this.

Aha - I see there is already a (3 yr old!) bug about this, and someone has just
supplied a patch. Any reason not to upload this?

Wookey