updateiconcache: Sort list of entries
because filesystem readdir order is indeterministic. Without this patch, building openSUSE's balsa package had variations between builds in /usr/share/balsa/icon-theme.cache
because filesystem readdir order is indeterministic. Without this patch, building openSUSE's balsa package had variations between builds in /usr/share/balsa/icon-theme.cache
mentioned in commit 85076827