remote: remove outdated comment about Solaris

When removing a conditional in:

  commit da1ade7a
  Author: Daniel P. Berrangé <berrange@redhat.com>
  Date:   Fri Mar 23 10:50:59 2018 +0000

    remote: remove some __sun conditionals

the corresponding comment was mistakenly left behind.
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

src/remote/remote_driver.c

@@ -1344,9 +1344,7 @@ remoteConnectOpen(virConnectPtr conn,
 
     /*
      * If URI is NULL, then do a UNIX connection possibly auto-spawning
-     * unprivileged server and probe remote server for URI. On Solaris,
-     * this isn't supported, but we may be privileged enough to connect
-     * to the UNIX socket anyway.
+     * unprivileged server and probe remote server for URI.
      */
     if (!conn->uri) {
         VIR_DEBUG("Auto-probe remote URI");