Remove the date from man pages

It's not something we're keeping up to date anyway.
diff --git a/unix/x0vncserver/x0vncserver.man b/unix/x0vncserver/x0vncserver.man
index 11344bb..d470672 100644
--- a/unix/x0vncserver/x0vncserver.man
+++ b/unix/x0vncserver/x0vncserver.man
@@ -1,4 +1,4 @@
-.TH X0VNCSERVER 1 "Dec 23, 2008" "TigerVNC" "TigerVNC Manual"
+.TH X0VNCSERVER 1 "" "TigerVNC" "TigerVNC Manual"
 .SH NAME
 x0vncserver \- TigerVNC Server for X displays
 .SH SYNOPSIS