patch applied (ghc): Use update-alternatives for handling generic tool names

[Malcolm Wallace]

Sven Panne <sven.panne at aedion.de> wrote:

> OK, now I remember. :-) Hmmm, that seems to indicate that splitting
> off at  least cpphs from the Hugs/nhc98 distributions is the right
> way. And because  of a similar reasoning, hsc2hs should not be
> distributed with nhc98.

But the very reason that cpphs and hsc2hs are distributed with hugs and
nhc98 is for bootstrapping.  If you don't already have a Haskell
compiler on your machine, then you can't install cpphs or hsc2hs.  But
conversely, you can't install either of these compilers without them.

Let's not go the route of requiring a working ghc before you can install
any other compiler.

Regards,
    Malcolm