update reqs for newer razorqt respect cmake

as issue #632, the minimun reqs for razorqt now changed:
minimum requeriments are cmake >= 2.8.7 that also requires e2fsprogs >= 1.41.8 (with discard fix patches) and libarchive >= 2.8.3
users for squeeze and lenny can use the venenux repositories and build a complete (almost) razorqt desktop:

* e2fsprogs
* libarchive
* cmake

and then build razorqt

so control file must be changed...