Remove the date from man pages

It's not something we're keeping up to date anyway.
diff --git a/unix/vncconfig/vncconfig.man b/unix/vncconfig/vncconfig.man
index 01352e1..aa35303 100644
--- a/unix/vncconfig/vncconfig.man
+++ b/unix/vncconfig/vncconfig.man
@@ -1,4 +1,4 @@
-.TH vncconfig 1 "17 Apr 2006" "TigerVNC" "Virtual Network Computing"
+.TH vncconfig 1 "" "TigerVNC" "Virtual Network Computing"
 .SH NAME
 vncconfig \- configure and control a VNC server
 .SH SYNOPSIS