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

Fix small warnings, turn on -Wall -Werror.

Change-Id: Iab1f01a7c7ebd6ba832b75067c5e395f380a1b8b
diff --git a/cmds/screencap/Android.mk b/cmds/screencap/Android.mk
index 5c11b75..b0dc422 100644
--- a/cmds/screencap/Android.mk
+++ b/cmds/screencap/Android.mk
@@ -2,13 +2,13 @@
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES:= \
-	screencap.cpp
+    screencap.cpp
 
 LOCAL_SHARED_LIBRARIES := \
-	libcutils \
-	libutils \
-	libbinder \
-	libskia \
+    libcutils \
+    libutils \
+    libbinder \
+    libskia \
     libui \
     libgui
 
@@ -16,4 +16,6 @@
 
 LOCAL_MODULE_TAGS := optional
 
+LOCAL_CFLAGS += -Wall -Werror -Wunused -Wunreachable-code
+
 include $(BUILD_EXECUTABLE)