use LC_ALL=C to sort libvpx_*srcs.txt

Change-Id: I387da141ebade4fc4d2f3c0a2b6aa5aaea091c0c

libs.mk

diff --git a/libs.mk b/libs.mk
index 4aee94e..e48d55c 100644
--- a/libs.mk
+++ b/libs.mk
@@ -179,7 +179,7 @@
 # based build systems.
 libvpx_srcs.txt:
 	@echo "    [CREATE] $@"
-	@echo $(CODEC_SRCS) | xargs -n1 echo | sort -u > $@
+	@echo $(CODEC_SRCS) | xargs -n1 echo | LC_ALL=C sort -u > $@
 CLEAN-OBJS += libvpx_srcs.txt
 
 
@@ -356,7 +356,7 @@
 
 libvpx_test_srcs.txt:
 	@echo "    [CREATE] $@"
-	@echo $(LIBVPX_TEST_SRCS) | xargs -n1 echo | sort -u > $@
+	@echo $(LIBVPX_TEST_SRCS) | xargs -n1 echo | LC_ALL=C sort -u > $@
 CLEAN-OBJS += libvpx_test_srcs.txt
 
 $(LIBVPX_TEST_DATA): $(SRC_PATH_BARE)/test/test-data.sha1