File N_use-icewm.patch of Package tigervnc

vncserver script starts new desktop based on WINDOWMANAGER variable. If none is set, it used to start xterm in twm. As we no longer distribute twm, switch to icewm.
Index: tigervnc-1.6.0/unix/vncserver
===================================================================
--- tigervnc-1.6.0.orig/unix/vncserver
+++ tigervnc-1.6.0/unix/vncserver
@@ -81,8 +81,8 @@ $defaultXStartup
        "[ -r \$HOME/.Xresources ] && xrdb \$HOME/.Xresources\n".
        "xsetroot -solid grey\n".
        "xterm -geometry 80x24+10+10 -ls -title \"\$VNCDESKTOP Desktop\" &\n".
-       "if [ -x /usr/bin/twm ]; then\n".
-       "  /usr/bin/twm &\n".
+       "if [ -x /usr/bin/icewm ]; then\n".
+       "  /usr/bin/icewm &\n".
        "else\n".
        "  echo \"No window manager found. You should install a window manager to get properly working VNC session.\"\n".
        "fi\n");