GPU: Make the Textures::CopySwizzledData function accessible from the outside of the file.

src/video_core/textures/decoders.h

@@ -17,6 +17,10 @@ namespace Texture {
 std::vector<u8> UnswizzleTexture(VAddr address, TextureFormat format, u32 width, u32 height,
                                  u32 block_height = TICEntry::DefaultBlockHeight);
 
+/// Copies texture data from a buffer and performs swizzling/unswizzling as necessary.
+void CopySwizzledData(u32 width, u32 height, u32 bytes_per_pixel, u32 out_bytes_per_pixel,
+                      u8* swizzled_data, u8* unswizzled_data, bool unswizzle, u32 block_height);
+
 /**
  * Decodes an unswizzled texture into a A8R8G8B8 texture.
  */