wxGTK2 -> wxGTK rename without Provides

[Kevin Kofler]

Nicolas Mailhot wrote:
> IMHO it is perfectly ok to clean up old cruft, or it accumulates and
> the packages start to be musty.

But versioned Provides are not "old cruft":
* They don't accumulate - if Qt is Qt 4, it only Provides: qt4(-devel) and
not qt3(-devel), qt2(-devel) or qt1(-devel), that's the whole point of this
system.
* They will have to be reintroduced when the migration to the next version
happens (e.g. Qt 5), so there's no point in removing them (and we don't
plan to do it in the case of Qt).

The wxGTK2 case is particular though in that the maintainer doesn't expect
another transition period to be needed when the move to GTK+ 3 happens,
because wxWidgets is supposed to abstract the difference away (see his
reply to my message). Let's see.

        Kevin Kofler