\param populated true to initialize it from the C runtime environment,
false to create an empty environment.
\returns a pointer to the new environment or NULL on failure; call
SDL_GetError() for more information.
\threadsafety If populated is false, it is safe to call this function
from any thread, otherwise it is safe if no other threads are
calling setenv() or unsetenv()
\since This function is available since SDL 3.2.0.
Create a set of environment variables
\param populated true to initialize it from the C runtime environment, false to create an empty environment. \returns a pointer to the new environment or NULL on failure; call SDL_GetError() for more information.
\threadsafety If populated is false, it is safe to call this function from any thread, otherwise it is safe if no other threads are calling setenv() or unsetenv()
\since This function is available since SDL 3.2.0.
\sa SDL_GetEnvironmentVariable \sa SDL_GetEnvironmentVariables \sa SDL_SetEnvironmentVariable \sa SDL_UnsetEnvironmentVariable \sa SDL_DestroyEnvironment