Sets env variable XDG_CONFIG_DIRS
Sets env variable XDG_CONFIG_DIRS

If not set, we set it to LXQT_ETC_XDG_DIR. LXQT_ETC_XDG_DIR can be user set
or automatically set in liblxqt configure.

stefonarch/lxqt-session,lxde/lxqt-session,lxde/lxqt-session,lxde/lxqt-session,stefonarch/lxqt-session,stefonarch/lxqt-session