Re-introduce Conflicts - rfbz#6612

This time the related provides aren't added so this avoid the conflicts
with itslef.

This also relies upon unversioned Recommends in the fedora
counterparts to avoid packages been replaced in end-users back.

mesa-freeworld.spec

@@ -149,6 +149,7 @@ BuildRequires:  pkgconfig(vulkan)
 %package        -n %{srcname}-va-drivers-freeworld
 Summary:        Mesa-based VA-API drivers
 Requires:       %{srcname}-filesystem%{?_isa} = %{?epoch:%{epoch}:}%{version}
+Conflicts:      %{srcname}-va-drivers%{?_isa}
 
 %description    -n %{srcname}-va-drivers-freeworld
 %{_description}
@@ -158,6 +159,7 @@ Requires:       %{srcname}-filesystem%{?_isa} = %{?epoch:%{epoch}:}%{version}
 %package        -n %{srcname}-vdpau-drivers-freeworld
 Summary:        Mesa-based VDPAU drivers
 Requires:       %{srcname}-filesystem%{?_isa} = %{?epoch:%{epoch}:}%{version}
+Conflicts:      %{srcname}-vdpau-drivers%{?_isa}
 
 %description 	-n %{srcname}-vdpau-drivers-freeworld
 %{_description}