mk: set ENV_POST_LOADED=1 after first loading env_post.mk

If ENV_POST_LOADED isn't defined, not to set ENV_PRE_LOADED=1, but to
set ENV_POST_LOADED=1 with the purpose of avoiding repeated loading.

Signed-off-by: Nan Liu <nan.liu619@gmail.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
1 file changed