Compile using C99.

Change-Id: Ifda03e0b3ee3a915bf7ce5a5dce27e5e215dcce2

Conflicts:
	bta/Android.mk
	gki/Android.mk
	main/Android.mk
	stack/Android.mk
	test/bluedroidtest/Android.mk
diff --git a/gki/Android.mk b/gki/Android.mk
index e9ad13a..d00478d 100644
--- a/gki/Android.mk
+++ b/gki/Android.mk
@@ -9,7 +9,7 @@
                    $(LOCAL_PATH)/../utils/include \
                    $(bdroid_C_INCLUDES) \
 
-LOCAL_CFLAGS += -Werror -Wno-error=unused-parameter $(bdroid_CFLAGS)
+LOCAL_CFLAGS += -Werror -Wno-error=unused-parameter $(bdroid_CFLAGS) -std=c99
 
 ifeq ($(BOARD_HAVE_BLUETOOTH_BCM),true)
 LOCAL_CFLAGS += \