Revert "video: Prefer Wayland over X11 (take 2!)"

This reverts commit f9f7db4

Wayland has a myriad of unresolved problems regarding surface suspension
blocking presentation and the FIFO (vsync) implementation being
fundamentally broken leading to reduced GPU-bound performance.

That is not to say "we should fix FIFO in Mesa/other drivers," but rather
that it is completely unfixable without an additional protocol, in this
case fifo-v1[1].

Without this protocol, vkQueuePresent or glSwapBuffers *must* stall for
the 'frame' callback after presenting an image. This also does not
interact well with GPU work not being done etc. It is fundamentally
broken by design, and could lead to skipped frames.
The only reason we can get away with this on SteamOS is because
Gamescope implements what is essentially fifo-v1 and we use that there.

The other side is surface suspension -- a very similar issue to the
above wrt the frame callback being used in that way and blocking.
If the SDL window is obscured, vkQueuePresent *will* block in FIFO,
which games typically do NOT like. This is solved by the combination of
fifo-v1 and commit-timing-v1.

There is no advantage to games and average applications preferring
Wayland over X11 -- only severe performance and unusability regressions
right now.
Thus, we must revert this change until fifo-v1 and commit-timing-v1 are
released and at least in a stable release for major compositors.

[1]: https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/256

src/video/SDL_video.c

@@ -69,12 +69,12 @@ static VideoBootStrap *bootstrap[] = {
 #ifdef SDL_VIDEO_DRIVER_COCOA
     &COCOA_bootstrap,
 #endif
-#ifdef SDL_VIDEO_DRIVER_WAYLAND
-    &Wayland_bootstrap,
-#endif
 #ifdef SDL_VIDEO_DRIVER_X11
     &X11_bootstrap,
 #endif
+#ifdef SDL_VIDEO_DRIVER_WAYLAND
+    &Wayland_bootstrap,
+#endif
 #ifdef SDL_VIDEO_DRIVER_VIVANTE
     &VIVANTE_bootstrap,
 #endif
@@ -4904,12 +4904,12 @@ int SDL_GetMessageBoxCount(void)
 #ifdef SDL_VIDEO_DRIVER_UIKIT
 #include "uikit/SDL_uikitmessagebox.h"
 #endif
-#ifdef SDL_VIDEO_DRIVER_WAYLAND
-#include "wayland/SDL_waylandmessagebox.h"
-#endif
 #ifdef SDL_VIDEO_DRIVER_X11
 #include "x11/SDL_x11messagebox.h"
 #endif
+#ifdef SDL_VIDEO_DRIVER_WAYLAND
+#include "wayland/SDL_waylandmessagebox.h"
+#endif
 #ifdef SDL_VIDEO_DRIVER_HAIKU
 #include "haiku/SDL_bmessagebox.h"
 #endif