gpu: Add BC2_RGBA_UNORM_SRGB to GetBlockWidth/Height functions

src/gpu/SDL_sysgpu.h

diff --git a/src/gpu/SDL_sysgpu.h b/src/gpu/SDL_sysgpu.h
index 21dcfbd..8469d94 100644
--- a/src/gpu/SDL_sysgpu.h
+++ b/src/gpu/SDL_sysgpu.h
@@ -209,6 +209,7 @@
     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:
@@ -326,6 +327,7 @@
     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: