FcLangSetCompare - compare language sets
#include <fontconfig/fontconfig.h>
FcLangResult FcLangSetCompare (const FcLangSet *ls_a, const FcLangSet *ls_b);
FcLangSetCompare compares language coverage for ls_a
and ls_b. If they share any language and territory pair, this
function returns FcLangEqual. If they share a language but differ in which
territory that language is for, this function returns
FcLangDifferentTerritory. If they share no languages in common, this
function returns FcLangDifferentLang.