- fixed compilation of POSIX targets

src/posix/cocoa/i_main.mm:152:2: error: use of undeclared identifier 'ShutdownJoysticks'
src/posix/sdl/i_system.cpp:128:3: error: ‘I_FatalError_Gtk’ was not declared in this scope
src/posix/sdl/st_start.cpp:329:8: error: ‘CExitEvent’ was not declared in this scope

src/posix/cocoa/i_main.mm

@@ -149,7 +149,6 @@ int OriginalMainTry(int argc, char** argv)
 	progdir += "/";
 
 	auto ret =  D_DoomMain();
-	ShutdownJoysticks();
 	FConsoleWindow::DeleteInstance();
 	return ret;
 }

src/posix/sdl/i_system.cpp

@@ -125,7 +125,7 @@ void Linux_I_FatalError(const char* errortext)
 #ifndef NO_GTK
 	else if (I_GtkAvailable())
 	{
-		I_FatalError_Gtk(errortext);
+		I_ShowFatalError_Gtk(errortext);
 	}
 #endif
 	else

src/posix/sdl/st_start.cpp

@@ -42,6 +42,7 @@
 #include "doomdef.h"
 #include "i_system.h"
 #include "c_cvars.h"
+#include "doomerrors.h"
 
 // MACROS ------------------------------------------------------------------