[backend] kiwi builds: use repoarch for builds with arch=local

This makes kiwi use the correct scheduler architecture, i.e.
the architecture configured in $BSConfig::localarch.

src/backend/BSSched/BuildJob.pm

@@ -1060,7 +1060,8 @@ sub create {
         $_->{'version'}    = $d->{'version'};
         $_->{'release'}    = $d->{'release'} if defined $d->{'release'};
         $_->{'arch'}       = $d->{'arch'} if $d->{'arch'};
-        $_->{'preimghdrmd5'} = $d->{'hdrmd5'} if !$_->{'noinstall'} &&  $d->{'hdrmd5'};
+        $_->{'preimghdrmd5'} = $d->{'hdrmd5'} if !$_->{'noinstall'} && $d->{'hdrmd5'};
+	$_->{'repoarch'}   = $BSConfig::localarch if $myarch eq 'local' && $BSConfig::localarch;
       }
     }
   }