change isdn4k-utils to optional

[Ralf Ertzinger]

Hi.

On Sun, 14 Sep 2008 02:07:07 -0700, Conrad Meyer wrote

> Right, the OP wasn't talking about removing the package from Fedora
> entirely, but disabling it as a default installed package. Users who
> need ISDN for non-internet purposes can always download the isdn
> packages from repositories, whereas those who need it to connect to
> the internet would be out of luck if it was disabled by default (for
> new installs, anyways).

Thus, my suggestion to split the package into the bits needed for
internet access and those not.