Fix reproducibility issue caused by unsorted wildcard expansion.

Upstream-Status: Pending
RP 2021/3/1

Index: git/src/Makefile
===================================================================
--- git.orig/src/Makefile
+++ git/src/Makefile
@@ -15,7 +15,7 @@ TARGETS=$(LIBTARGETS) $(BINTARGETS) $(PC
 STATICTARGETS=$(STATICLIBTARGETS) $(STATICBINTARGETS)
 
 LIBEFIBOOT_SOURCES = crc32.c creator.c disk.c gpt.c loadopt.c path-helpers.c \
-		     linux.c $(wildcard linux-*.c)
+		     linux.c $(sort $(wildcard linux-*.c))
 LIBEFIBOOT_OBJECTS = $(patsubst %.c,%.o,$(LIBEFIBOOT_SOURCES))
 LIBEFIVAR_SOURCES = dp.c dp-acpi.c dp-hw.c dp-media.c dp-message.c \
 	efivarfs.c error.c export.c guid.c guids.S guid-symbols.c \