Win32: avoid warning about "pidfile"

src/interface/interface.c

@@ -197,10 +197,12 @@ int libvlc_InternalAddIntf(libvlc_int_t *libvlc, const char *name)
         char *intf = var_InheritString(libvlc, "intf");
         if (intf == NULL) /* "intf" has not been set */
         {
+#if !defined(_WIN32) && !defined(__OS2__)
             char *pidfile = var_InheritString(libvlc, "pidfile");
             if (pidfile != NULL)
                 free(pidfile);
             else
+#endif
                 msg_Info(libvlc, _("Running vlc with the default interface. "
                          "Use 'cvlc' to use vlc without interface."));
         }