lib/Makefile: Fix static library reproducibility

The static library contents varies depending of the order of the object files on disk meaning
it isn't reproducible.

To avoid this, use the SRCFILES values which are already sorted, mapped to the object names
instead.


Upstream-Status: Submitted [https://github.com/lz4/lz4/pull/1497]
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Index: git/lib/Makefile
===================================================================
--- git.orig/lib/Makefile
+++ git/lib/Makefile
@@ -55,6 +55,7 @@ CFLAGS   = $(DEBUGFLAGS) $(USERCFLAGS)
 ALLFLAGS = $(CFLAGS) $(CPPFLAGS) $(LDFLAGS)
 
 SRCFILES := $(sort $(wildcard *.c))
+OBJFILES = $(SRCFILES:.c=.o)
 
 include ../Makefile.inc
 
@@ -102,7 +103,7 @@ liblz4.a: $(SRCFILES)
 ifeq ($(BUILD_STATIC),yes)  # can be disabled on command line
 	@echo compiling static library
 	$(COMPILE.c) $^
-	$(AR) rcs $@ *.o
+	$(AR) rcs $@ $(OBJFILES)
 endif
 
 ifeq ($(WINBASED),yes)