Updata gcc-8.4

Change-Id: I052bfaaca0555b7c165d6199b937b155b51a2fca
diff --git a/mbtk/Make.defines b/mbtk/Make.defines
index 341276e..bb6556a 100755
--- a/mbtk/Make.defines
+++ b/mbtk/Make.defines
@@ -54,7 +54,8 @@
 	-DNOT_DROPPED_FLAGS_TEST \

 	-DNDEBUG \

 	-UDEBUG \

-	-D_FORTIFY_SOURCE=2

+	-D_FORTIFY_SOURCE=2 \

+	-D_GNU_SOURCE

 

 LIB_DIR = \

 	-L$(OUT_DIR)/lib