Update makefiles after merge of Chromium at fb34b348eead

This commit was generated by merge_from_chromium.py.

Change-Id: Ic41bffd993445664617b532aa64983365e0df06c
diff --git a/libyuv.target.darwin-mips.mk b/libyuv.target.darwin-mips.mk
index 59643f6..e446e24 100644
--- a/libyuv.target.darwin-mips.mk
+++ b/libyuv.target.darwin-mips.mk
@@ -87,6 +87,7 @@
 	-Wno-sequence-point \
 	-Os \
 	-g \
+	-gdwarf-4 \
 	-fdata-sections \
 	-ffunction-sections \
 	-fomit-frame-pointer \