Frameworks/base: Turn on -Wall -Werror in cmds

Fix small warnings, turn on -Wall -Werror.

Change-Id: Iab1f01a7c7ebd6ba832b75067c5e395f380a1b8b
diff --git a/cmds/interrupter/Android.mk b/cmds/interrupter/Android.mk
index e324627..97a96bf 100644
--- a/cmds/interrupter/Android.mk
+++ b/cmds/interrupter/Android.mk
@@ -7,6 +7,7 @@
 LOCAL_MODULE := interrupter
 LOCAL_MODULE_TAGS := eng tests
 LOCAL_LDFLAGS := -ldl
+LOCAL_CFLAGS := -Wall -Werror -Wunused -Wunreachable-code
 
 include $(BUILD_SHARED_LIBRARY)
 
@@ -17,5 +18,6 @@
 LOCAL_MODULE := interrupter
 LOCAL_MODULE_TAGS := eng tests
 LOCAL_LDFLAGS := -ldl
+LOCAL_CFLAGS := -Wall -Werror -Wunused -Wunreachable-code
 
-include $(BUILD_HOST_SHARED_LIBRARY)
\ No newline at end of file
+include $(BUILD_HOST_SHARED_LIBRARY)