Remove efj script

This script has not worked in Fedora for many releases now, but
no-one has complained, so probably no-one is using it. Users can
still invoke the standalone formatter like this instead:

$ eclipse -application org.eclipse.jdt.core.JavaCodeFormatter

Change-Id: I1bfc3eb039af0e55eae62661f9096b3d76ce7979
Signed-off-by: Mat Booth <mat.booth@redhat.com>
Reviewed-on: https://git.eclipse.org/r/92396