\param env the environment to query.
\param name the name of the variable to get.
\returns a pointer to the value of the variable or NULL if it can't be
found.
\threadsafety It is safe to call this function from any thread.
\since This function is available since SDL 3.2.0.
Get the value of a variable in the environment.
\param env the environment to query. \param name the name of the variable to get. \returns a pointer to the value of the variable or NULL if it can't be found.
\threadsafety It is safe to call this function from any thread.
\since This function is available since SDL 3.2.0.
\sa SDL_GetEnvironment \sa SDL_CreateEnvironment \sa SDL_GetEnvironmentVariables \sa SDL_SetEnvironmentVariable \sa SDL_UnsetEnvironmentVariable