bzero is a macro in android-21

diff -u -r ../openssh-6.7p1/openbsd-compat/explicit_bzero.c ./openbsd-compat/explicit_bzero.c
--- ../openssh-6.7p1/openbsd-compat/explicit_bzero.c	2014-08-26 16:32:02.000000000 -0400
+++ ./openbsd-compat/explicit_bzero.c	2014-12-20 10:01:24.551588019 -0500
@@ -23,16 +23,10 @@
 
 #else /* HAVE_MEMSET_S */
 
-/*
- * Indirect bzero through a volatile pointer to hopefully avoid
- * dead-store optimisation eliminating the call.
- */
-static void (* volatile ssh_bzero)(void *, size_t) = bzero;
-
 void
 explicit_bzero(void *p, size_t n)
 {
-	ssh_bzero(p, n);
+	bzero(p, n);
 }
 
 #endif /* HAVE_MEMSET_S */