Remove: ENABLE_NETWORK switch

This switch has been a pain for years. Often disabling broke
compilation, as no developer compiles OpenTTD without, neither do
any of our official binaries.

Additionaly, it has grown so hugely in our codebase, that it
clearly shows that the current solution was a poor one. 350+
instances of "#ifdef ENABLE_NETWORK" were in the code, of which
only ~30 in the networking code itself. The rest were all around
the code to do the right thing, from GUI to NewGRF.

A more proper solution would be to stub all the functions, and
make sure the rest of the code can simply assume network is
available. This was also partially done, and most variables were
correct if networking was disabled. Despite that, often the #ifdefs
were still used.

With the recent removal of DOS, there is also no platform anymore
which we support where networking isn't working out-of-the-box.

All in all, it is time to remove the ENABLE_NETWORK switch. No
replacement is planned, but if you feel we really need this option,
we welcome any Pull Request which implements this in a way that
doesn't crawl through the code like this diff shows we used to.

1 files changed, 0 insertions, 18 deletions

diff --git a/src/network/network.h b/src/network/network.h
index 26f94482e..9f8e3b790 100644
--- a/src/network/network.h
+++ b/src/network/network.h
@@ -12,9 +12,6 @@
 #ifndef NETWORK_H
 #define NETWORK_H
 
-
-#ifdef ENABLE_NETWORK
-
 void NetworkStartUp();
 void NetworkShutDown();
 void NetworkDrawChatMessage();
@@ -26,19 +23,4 @@ extern bool _network_available;  ///< is network mode available?
 extern bool _network_dedicated;  ///< are we a dedicated server?
 extern bool _is_network_server;  ///< Does this client wants to be a network-server?
 
-#else /* ENABLE_NETWORK */
-/* Network function stubs when networking is disabled */
-
-static inline void NetworkStartUp() {}
-static inline void NetworkShutDown() {}
-static inline void NetworkDrawChatMessage() {}
-static inline bool HasClients() { return false; }
-
-#define _networking 0
-#define _network_server 0
-#define _network_available 0
-#define _network_dedicated 0
-#define _is_network_server 0
-
-#endif /* ENABLE_NETWORK */
 #endif /* NETWORK_H */