Add SDL_UpdateNVTexture() to update NV12/21 Texture (bug #5430)

for renderer software, opengl, and opengles2

src/render/SDL_sysrender.h

@@ -136,6 +136,10 @@ struct SDL_Renderer
                             const Uint8 *Yplane, int Ypitch,
                             const Uint8 *Uplane, int Upitch,
                             const Uint8 *Vplane, int Vpitch);
+    int (*UpdateTextureNV) (SDL_Renderer * renderer, SDL_Texture * texture,
+                            const SDL_Rect * rect,
+                            const Uint8 *Yplane, int Ypitch,
+                            const Uint8 *UVplane, int UVpitch);
     int (*LockTexture) (SDL_Renderer * renderer, SDL_Texture * texture,
                         const SDL_Rect * rect, void **pixels, int *pitch);
     void (*UnlockTexture) (SDL_Renderer * renderer, SDL_Texture * texture);