Sort more instances of wildcard and find

Many of these may not make a difference in the output images, but it's a
good idea to keep the make system as repeatable as possible.

Change-Id: I31804b8ad5805148ed08be7426a242a16f4d0df3
diff --git a/core/definitions.mk b/core/definitions.mk
index 07c5d9b..c6ff58b 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -414,7 +414,7 @@
 
 define find-parent-file
 $(strip \
-  $(eval _fpf := $(wildcard $(foreach f, $(2), $(strip $(1))/$(f)))) \
+  $(eval _fpf := $(sort $(wildcard $(foreach f, $(2), $(strip $(1))/$(f))))) \
   $(if $(_fpf),$(_fpf), \
        $(if $(filter-out ./ .,$(1)), \
              $(call find-parent-file,$(patsubst %/,%,$(dir $(1))),$(2)) \