Further fixes for Haiku

- Haiku is Unix-like, but it still doesn't use libnotify.
- Haiku comes with its own sets of definitions for certain long variables.
  There's still a problem revolving around the variables, but I removed a
  duplicate, conflicting definition on the Haiku platform.
- Changed some definition-related logic in detect.h, because the gcc compiler
  in Haiku (version 8.3.0) complained about duplicate definitions. I chose to
  use 'unknown' rather than an empty string on one occasion.
- Changed size of m_aLastSoundPlayed[CHAT_NUM] in
  `src/game/client/components/chat.cpp` due to an undocumented/undiscovered bug
  in Haiku.

src/base/detect.h

@@ -179,7 +179,13 @@
 #define PLATFORM_SUFFIX ""
 #endif
 
-#define CONF_PLATFORM_STRING PLATFORM_STRING PLATFORM_SUFFIX
+#ifndef CONF_PLATFORM_STRING
+#define CONF_PLATFORM_STRING "unknown"
+#endif
+
+#ifndef PLATFORM_STRING
+#define PLATFORM_STRING "unknown"
+#endif
 
 #ifndef CONF_ARCH_STRING
 #define CONF_ARCH_STRING "unknown"

src/engine/client/backend_sdl.cpp

@@ -1115,7 +1115,8 @@ void CGraphicsBackend_SDL_OpenGL::SetWindowParams(int FullscreenMode, bool IsBor
 	{
 		if(FullscreenMode == 1)
 		{
-#if defined(CONF_PLATFORM_MACOS) || defined(CONF_PLATFORM_HAIKU) // Todo SDL: remove this when fixed (game freezes when losing focus in fullscreen)
+#if defined(CONF_PLATFORM_MACOS) || defined(CONF_PLATFORM_HAIKU)
+// Todo SDL: remove this when fixed (game freezes when losing focus in fullscreen)
 			SDL_SetWindowFullscreen(m_pWindow, SDL_WINDOW_FULLSCREEN_DESKTOP);
 #else
 			SDL_SetWindowFullscreen(m_pWindow, SDL_WINDOW_FULLSCREEN);

src/engine/client/notifications.cpp

@@ -4,7 +4,7 @@
 
 #if defined(CONF_PLATFORM_MACOS)
 // Code is in src/macos/notification.mm.
-#elif defined(CONF_FAMILY_UNIX) && !defined(CONF_PLATFORM_ANDROID)
+#elif defined(CONF_FAMILY_UNIX) && !defined(CONF_PLATFORM_ANDROID) && !defined(CONF_PLATFORM_HAIKU)
 #include <libnotify/notify.h>
 void NotificationsInit()
 {