Sort output of a find command in makefile

This should mean that there will be fewer spurious kati rebuilds of
the ninja files due to the output changing.

Change-Id: I26beb4ae1d95fe591c3854772b804718b41fe53c
(cherry picked from commit 80c0d7905ea2763caf4c561d9d033d03f1b3fc83)
1 file changed