gpu: Add BC2_RGBA_UNORM_SRGB to GetBlockWidth/Height functions

src/gpu/SDL_sysgpu.h

@@ -136,6 +136,7 @@ static inline Sint32 Texture_GetBlockWidth(
     case SDL_GPU_TEXTUREFORMAT_BC6H_RGB_FLOAT:
     case SDL_GPU_TEXTUREFORMAT_BC6H_RGB_UFLOAT:
     case SDL_GPU_TEXTUREFORMAT_BC1_RGBA_UNORM_SRGB:
+    case SDL_GPU_TEXTUREFORMAT_BC2_RGBA_UNORM_SRGB:
     case SDL_GPU_TEXTUREFORMAT_BC3_RGBA_UNORM_SRGB:
     case SDL_GPU_TEXTUREFORMAT_BC7_RGBA_UNORM_SRGB:
     case SDL_GPU_TEXTUREFORMAT_ASTC_4x4_UNORM:
@@ -253,6 +254,7 @@ static inline Sint32 Texture_GetBlockHeight(
     case SDL_GPU_TEXTUREFORMAT_BC6H_RGB_FLOAT:
     case SDL_GPU_TEXTUREFORMAT_BC6H_RGB_UFLOAT:
     case SDL_GPU_TEXTUREFORMAT_BC1_RGBA_UNORM_SRGB:
+    case SDL_GPU_TEXTUREFORMAT_BC2_RGBA_UNORM_SRGB:
     case SDL_GPU_TEXTUREFORMAT_BC3_RGBA_UNORM_SRGB:
     case SDL_GPU_TEXTUREFORMAT_BC7_RGBA_UNORM_SRGB:
     case SDL_GPU_TEXTUREFORMAT_ASTC_5x4_UNORM: