evas - Added eina_stringshare_ref call for fallbacks, lang in font description.

Summary:
When the fdesc(Font Description) is duplicated,
ref of all of stringshare pointers should be increased.
But, in the evas_font_desc_dup API, we only increased ref for name string.
It can cause some of memory issues.

Reviewers: tasn, woohyun, seoz, Hermet

CC: cedric

Differential Revision: https://phab.enlightenment.org/D570

src/lib/evas/canvas/evas_font_dir.c

@@ -444,6 +444,8 @@ evas_font_desc_dup(const Evas_Font_Description *fdesc)
    new->ref = 1;
    new->is_new = EINA_TRUE;
    new->name = eina_stringshare_ref(new->name);
+   new->fallbacks = eina_stringshare_ref(new->fallbacks);
+   new->lang = eina_stringshare_ref(new->lang);
 
    return new;
 }