Merge branch 'no-dedi-sighandle-window' into 'next'

Disable SDL error message on dedicated servers

See merge request !1735

src/sdl/i_system.c

@@ -358,6 +358,7 @@ static void I_ReportSignal(int num, int coredumped)
 
 	I_OutputMsg("\nProcess killed by signal: %s\n\n", sigmsg);
 
+	if (!M_CheckParm("-dedicated"))
 		SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
 			"Process killed by signal",
 			sigmsg, NULL);
@@ -2202,6 +2203,7 @@ static void newsignalhandler_Warn(const char *pr)
 
 	I_OutputMsg("%s\n", text);
 
+	if (!M_CheckParm("-dedicated"))
 		SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
 			"Startup error",
 			text, NULL);
@@ -2405,6 +2407,7 @@ void I_Error(const char *error, ...)
 			// Implement message box with SDL_ShowSimpleMessageBox,
 			// which should fail gracefully if it can't put a message box up
 			// on the target system
+			if (!M_CheckParm("-dedicated"))
 				SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
 					"SRB2 "VERSIONSTRING" Recursive Error",
 					buffer, NULL);
@@ -2449,6 +2452,7 @@ void I_Error(const char *error, ...)
 	// Implement message box with SDL_ShowSimpleMessageBox,
 	// which should fail gracefully if it can't put a message box up
 	// on the target system
+	if (!M_CheckParm("-dedicated"))
 		SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
 			"SRB2 "VERSIONSTRING" Error",
 			buffer, NULL);