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3DS - Initialise screen render-target ourselves

Citro2D allocates a depth buffer for some reason, but CSE2 works fine
without one, even on real hardware

--- a/src/Backends/Rendering/3DS.cpp

+++ b/src/Backends/Rendering/3DS.cpp

@@ -13,8 +13,13 @@

 #define MIN(a, b) ((a) < (b) ? (a) : (b))

 #define MAX(a, b) ((a) > (b) ? (a) : (b))

+// Used to transfer the final rendered display to the framebuffer

+#define DISPLAY_TRANSFER_FLAGS \

+	(GX_TRANSFER_FLIP_VERT(0) | GX_TRANSFER_OUT_TILED(0) | GX_TRANSFER_RAW_COPY(0) | \

+	GX_TRANSFER_IN_FORMAT(GX_TRANSFER_FMT_RGBA8) | GX_TRANSFER_OUT_FORMAT(GX_TRANSFER_FMT_RGB8) | \

+	GX_TRANSFER_SCALING(GX_TRANSFER_SCALE_NO))

+

 // Used to convert textures to 3DS tiled format

-// Note: vertical flip flag set so 0,0 is top left of texture (lol no it isn't)

 #define TEXTURE_TRANSFER_FLAGS \

 	(GX_TRANSFER_FLIP_VERT(0) | GX_TRANSFER_OUT_TILED(1) | GX_TRANSFER_RAW_COPY(0) | \

 	GX_TRANSFER_IN_FORMAT(GX_TRANSFER_FMT_RGBA8) | GX_TRANSFER_OUT_FORMAT(GX_TRANSFER_FMT_RGBA8) | \

@@ -109,11 +114,12 @@

 	C2D_Init(C2D_DEFAULT_MAX_OBJECTS);

 	C2D_Prepare();

-	// Set up screen render target

-	screen_render_target = C2D_CreateScreenTarget(GFX_TOP, GFX_LEFT);

+	screen_render_target = C3D_RenderTargetCreate(240, 400, GPU_RB_RGBA8, -1);

 	if (screen_render_target != NULL)

 	{

+		C3D_RenderTargetSetOutput(screen_render_target, GFX_TOP, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);

+

 		framebuffer_surface = RenderBackend_CreateSurface(screen_width, screen_height, true);

 		if (framebuffer_surface != NULL)