It's always good to specify the setup path explicitly. If it's not specified,
ibus-setup finds ibus-setup-hangul in libexec, assuming ibus-hangul uses the
same libexec as ibus. Depending on this fallback makes it difficult to migrate
from FHS 2.0 (/usr/lib) to FHS 3.0 (/usr/libexec).
It's always good to specify the setup path explicitly. If it's not specified, ibus-setup finds ibus-setup-hangul in libexec, assuming ibus-hangul uses the same libexec as ibus. Depending on this fallback makes it difficult to migrate from FHS 2.0 (/usr/lib) to FHS 3.0 (/usr/libexec).