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setup: Add help links for Multiplayer windows.

The other windows all have help links now and the multiplayer
windows were the only ones left without them, so this adds links
for them. For now these just link to the wiki's Multiplayer page
but this is something we can change in the future.

This is part of #520.

--- a/src/setup/multiplayer.c

+++ b/src/setup/multiplayer.c

@@ -34,6 +34,10 @@

 #include "net_io.h"

 #include "net_query.h"

+#define MULTI_START_HELP_URL "http://www.chocolate-doom.org/setup-multi-start"

+#define MULTI_JOIN_HELP_URL "http://www.chocolate-doom.org/setup-multi-join"

+#define MULTI_CONFIG_HELP_URL "http://www.chocolate-doom.org/setup-multi-config"

+

 #define NUM_WADS 10

 #define NUM_EXTRA_PARAMS 10

@@ -711,6 +715,7 @@

     txt_widget_t *iwad_selector;

     window = TXT_NewWindow(window_title);

+    TXT_SetWindowHelpURL(window, MULTI_START_HELP_URL);

     TXT_AddWidgets(window, 

                    gameopt_table = TXT_NewTable(2),

@@ -985,6 +990,7 @@

     txt_inputbox_t *address_box;

     window = TXT_NewWindow("Join multiplayer game");

+    TXT_SetWindowHelpURL(window, MULTI_JOIN_HELP_URL);

     TXT_AddWidgets(window, 

         gameopt_table = TXT_NewTable(2),

@@ -1093,6 +1099,7 @@

     int i;

     window = TXT_NewWindow("Multiplayer Configuration");

+    TXT_SetWindowHelpURL(window, MULTI_CONFIG_HELP_URL);

     TXT_AddWidgets(window, 

                    TXT_NewStrut(0, 1),