libgui: enable EGL_fence_sync usage for exynos5

Bug: 6876502
Change-Id: I2ec2800881dcba9e4f6ff32ffa1341a2de01f0a2
diff --git a/libs/gui/Android.mk b/libs/gui/Android.mk
index 1cda14e..4985765 100644
--- a/libs/gui/Android.mk
+++ b/libs/gui/Android.mk
@@ -44,6 +44,9 @@
 ifeq ($(TARGET_BOARD_PLATFORM), s5pc110)
 	LOCAL_CFLAGS += -DUSE_FENCE_SYNC
 endif
+ifeq ($(TARGET_BOARD_PLATFORM), exynos5)
+	LOCAL_CFLAGS += -DUSE_FENCE_SYNC
+endif
 ifneq ($(filter generic%,$(TARGET_DEVICE)),)
     # Emulator build
     LOCAL_CFLAGS += -DUSE_FENCE_SYNC