[m-rev.] diff: fix bug with --detect-libgrades and --make

[Peter Wang]

On Mon, 23 Sep 2013 15:55:58 +1000 (EST), Julien Fischer <jfischer at opturion.com> wrote:
> 
> Fixed.  On an unrelated note: why is hlc.gc.pregen installed there?  I
> though the intention was that it should not be installed.
> 

I didn't prevent pregen grades being installed (yet).
Actually, the pregen grade turned out to be useful to work around bug #299.

Peter