config: Remove obsolete CMAKE related text in the config.

Now that #3182 is fixed there is no reason to complain about cmake
being used to build Oscam. The binary contains proper full config.

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@8540 4b0bc96b-bc66-0410-9d44-ebda105a78c1