Support XKB_CONTEXT_NO_SECURE_GETENV flag
Since kwin play with CAP_SYS_NICE, secure_getenv will fail for xkbcommon to load user level xkbmap. This allows kwin to load config under ~/.config/xkb
Since kwin play with CAP_SYS_NICE, secure_getenv will fail for xkbcommon to load user level xkbmap. This allows kwin to load config under ~/.config/xkb