libcutils: turn on -Werror

- Deal with some -Wunused / -Wunused-variable issues

Change-Id: I28c23fb213382a392ec30935749fb359e072d664
diff --git a/libcutils/dlmalloc_stubs.c b/libcutils/dlmalloc_stubs.c
index c327a55..6dca911 100644
--- a/libcutils/dlmalloc_stubs.c
+++ b/libcutils/dlmalloc_stubs.c
@@ -15,20 +15,22 @@
  */
 
 #include "../../../bionic/libc/bionic/dlmalloc.h"
-#include "cutils/log.h"
+#include "log/log.h"
+
+#define UNUSED __attribute__((__unused__))
 
 /*
  * Stubs for functions defined in bionic/libc/bionic/dlmalloc.c. These
  * are used in host builds, as the host libc will not contain these
  * functions.
  */
-void dlmalloc_inspect_all(void(*handler)(void*, void *, size_t, void*),
-                          void* arg)
+void dlmalloc_inspect_all(void(*handler)(void*, void *, size_t, void*) UNUSED,
+                          void* arg UNUSED)
 {
   ALOGW("Called host unimplemented stub: dlmalloc_inspect_all");
 }
 
-int dlmalloc_trim(size_t unused)
+int dlmalloc_trim(size_t unused UNUSED)
 {
   ALOGW("Called host unimplemented stub: dlmalloc_trim");
   return 0;