[KDevelop] 6fa7873: Increase gdb version check to >= 7.1.0

[Syron]

> Don't really know, anybody
> knows whats up with other major distro's, are they shipping a new
> release in the next 2-4 months that would carry gdb 7.1?

I am using openSuSE 11.3, it already has gcc 4.5 and gdb 7.1 by default.
-- Syron