please drop openoffice.org from Packages-arch-specific

[Petr Salinger <Petr.Salinger@seznam.cz>]

Hello,

openoffice.org got support for GNU/kFreeBSD in 1:3.2.0-9.
The hurd is still not supported, but it shouldn't be too hard to
use kfreebsd patches (#578023) as hint what have to be adjusted
by hurd porters.

So I suggest to drop current openoffice.org line
  "%openoffice.org: !kfreebsd-amd64 !kfreebsd-i386 !hurd-i386"
from Packages-arch-specific entirely.

Thanks
	Petr