Use -Werror in frameworks/native/cmds

* Remove or comment out unused variables/functions.

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: I15a463eb9a20bc12787c104f671063ceeafaa1cc
diff --git a/cmds/service/Android.bp b/cmds/service/Android.bp
index b703ed4..9513ec1 100644
--- a/cmds/service/Android.bp
+++ b/cmds/service/Android.bp
@@ -8,7 +8,11 @@
         "libbinder",
     ],
 
-    cflags: ["-DXP_UNIX"],
+    cflags: [
+        "-DXP_UNIX",
+        "-Wall",
+        "-Werror",
+    ],
 }
 
 cc_binary {
@@ -22,5 +26,10 @@
         "libbinder",
     ],
 
-    cflags: ["-DXP_UNIX", "-DVENDORSERVICES"],
+    cflags: [
+        "-DXP_UNIX",
+        "-DVENDORSERVICES",
+        "-Wall",
+        "-Werror",
+    ],
 }