Replace system_nosh call with android_fork_execvp

Replace the system_nosh call with the android_fork_execvp from
liblogwrap.

Change-Id: Idfbc6bcf0bef16d4ee90d6af6bd4b07bc79913bb
diff --git a/NetdConstants.h b/NetdConstants.h
index ecb2ac2..704ee96 100644
--- a/NetdConstants.h
+++ b/NetdConstants.h
@@ -34,4 +34,6 @@
 int execIptables(IptablesTarget target, ...);
 int execIptablesSilently(IptablesTarget target, ...);
 
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a)))
+
 #endif