rpm: Simplify expression of supported platforms
rpm: Simplify expression of supported platforms

Stanzas like "0%{?fedora} && 0%{?fedora} >= %{min_fedora}" contain
redundant definitions, as "0%{?fedora} >= %{min_fedora}" implies that
"%fedora" is defined and has a value. Thus, we can simplify this.

Signed-off-by: Neal Gompa <8135daa3762340227c0c67f1c47ad07a127bd3a3@gmail.com>
Reviewed-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

libvirt/libvirt,olafhering/libvirt,jfehlig/libvirt,libvirt/libvirt,zippy2/libvirt,nertpinx/libvirt,crobinso/libvirt,jfehlig/libvirt,olafhering/libvirt,olafhering/libvirt,libvirt/libvirt,zippy2/libvirt,olafhering/libvirt,nertpinx/libvirt,nertpinx/libvirt,crobinso/libvirt,libvirt/libvirt,crobinso/libvirt,zippy2/libvirt,zippy2/libvirt,jfehlig/libvirt,nertpinx/libvirt,crobinso/libvirt,nertpinx/libvirt,jfehlig/libvirt