Remove network proxy-related command line option descriptions

The command line options themselves were removed in commit
168313b, wherein someone clearly didn't
do the full research.

Specifically, the SDL_net-based implementation of the network API never
supported or used these options. Only libana did.

doc/man/wesnoth.6

@@ -274,29 +274,6 @@ This switch should be typed before the
 .B --preprocess
 command.
 .TP
-.B --proxy
-enables usage of proxy for network connections.
-.TP
-.BI --proxy-address \ address
-specifies
-.I address
-of the proxy.
-.TP
-.BI --proxy-port \ port
-specifies
-.I port
-of the proxy.
-.TP
-.BI --proxy-user \ username
-specifies
-.I username
-to log in to the proxy.
-.TP
-.BI --proxy-password \ password
-specifies
-.I password
-to log in to the proxy.
-.TP
 .BI -r\  X x Y ,\ --resolution\  X x Y
 sets the screen resolution. Example:
 .B -r

src/commandline_options.cpp

@@ -274,19 +274,10 @@ commandline_options::commandline_options (const std::vector<std::string>& args)
 		("preprocess-output-macros", po::value<std::string>()->implicit_value(std::string()), "used only by the '--preprocess' command. Will output all preprocessed macros in the target file <arg>. If the file is not specified the output will be file '_MACROS_.cfg' in the target directory of preprocess's command.")
 		;
 
-	po::options_description proxy_opts("Proxy options");
-	proxy_opts.add_options()
-		("proxy", "enables usage of proxy for network connections.")
-		("proxy-address", po::value<std::string>(), "specifies address of the proxy.")
-		("proxy-port", po::value<std::string>(), "specifies port of the proxy.")
-		("proxy-user", po::value<std::string>(), "specifies username to log in to the proxy.")
-		("proxy-password", po::value<std::string>(), "specifies password to log in to the proxy.")
-		;
-
 	//hidden_.add_options()
 	//	("example-hidden-option", "")
 	//	;
-	visible_.add(general_opts).add(campaign_opts).add(display_opts).add(logging_opts).add(multiplayer_opts).add(testing_opts).add(preprocessor_opts).add(proxy_opts);
+	visible_.add(general_opts).add(campaign_opts).add(display_opts).add(logging_opts).add(multiplayer_opts).add(testing_opts).add(preprocessor_opts);
 
 	all_.add(visible_).add(hidden_);