Remove exported function create_server_list()

The guts of this function doesn't need to be in server.c - it only uses extern server functions so it
makes sense just to move it into the body of function_servers(), the only caller.

That means it's no longer accessible for loadable modules, but it isn't much use for them anyway.  They
can always directly access the server list if they need that info.

(Requires rolling the module table version).

include/module.h

@@ -10,7 +10,7 @@
  * if we change the table below, we change this module number to the 
  * current date (YYYYMMDDxx where xx is a serial number).
  */
-#define MODULE_VERSION 2017071002UL
+#define MODULE_VERSION 2017071701UL
 
 #include "struct.h"
 
@@ -253,7 +253,6 @@ enum FUNCTION_VALUE
 	ADD_TO_SERVER_LIST,
 	BUILD_SERVER_LIST,
 	DISPLAY_SERVER_LIST,
-	CREATE_SERVER_LIST,
 	PARSE_SERVER_INFO,
 	SERVER_LIST_SIZE,
 /* misc server/nickname functions */