Add missing includes.

Change-Id: Ibf549266a19a67eb9158d341a69dddfb654be669
diff --git a/libc/dns/net/getservent.c b/libc/dns/net/getservent.c
index 9f6ec32..0a727c7 100644
--- a/libc/dns/net/getservent.c
+++ b/libc/dns/net/getservent.c
@@ -28,6 +28,7 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>
 #include <endian.h>
+#include <malloc.h>
 #include <netdb.h>
 #include "servent.h"
 #include "services.h"