Removed unused SDL_ArrayOrder enumeration values

Fixes https://github.com/libsdl-org/SDL/issues/6658

include/SDL3/SDL_pixels.h

@@ -87,17 +87,11 @@ typedef enum
 } SDL_PackedOrder;
 
 /** Array component order, low byte -> high byte. */
-/* !!! FIXME: in 2.1, make these not overlap differently with
-   !!! FIXME:  SDL_PACKEDORDER_*, so we can simplify SDL_ISPIXELFORMAT_ALPHA */
 typedef enum
 {
     SDL_ARRAYORDER_NONE,
     SDL_ARRAYORDER_RGB,
-    SDL_ARRAYORDER_RGBA,
-    SDL_ARRAYORDER_ARGB,
     SDL_ARRAYORDER_BGR,
-    SDL_ARRAYORDER_BGRA,
-    SDL_ARRAYORDER_ABGR
 } SDL_ArrayOrder;
 
 /** Packed component layout. */
@@ -156,12 +150,7 @@ typedef enum
      ((SDL_PIXELORDER(format) == SDL_PACKEDORDER_ARGB) || \
       (SDL_PIXELORDER(format) == SDL_PACKEDORDER_RGBA) || \
       (SDL_PIXELORDER(format) == SDL_PACKEDORDER_ABGR) || \
-      (SDL_PIXELORDER(format) == SDL_PACKEDORDER_BGRA))) || \
-    (SDL_ISPIXELFORMAT_ARRAY(format) && \
-     ((SDL_PIXELORDER(format) == SDL_ARRAYORDER_ARGB) || \
-      (SDL_PIXELORDER(format) == SDL_ARRAYORDER_RGBA) || \
-      (SDL_PIXELORDER(format) == SDL_ARRAYORDER_ABGR) || \
-      (SDL_PIXELORDER(format) == SDL_ARRAYORDER_BGRA))))
+      (SDL_PIXELORDER(format) == SDL_PACKEDORDER_BGRA))))
 
 /* The flag is set to 1 because 0x1? is not in the printable ASCII range */
 #define SDL_ISPIXELFORMAT_FOURCC(format)    \