Add missing <malloc.h> and <string.h> includes.

Change-Id: Ia41756e607663d056e7d2fdd7ecbec7e5841a913
diff --git a/libsysutils/src/SocketClient.cpp b/libsysutils/src/SocketClient.cpp
index 8358823..bb9b6a1 100644
--- a/libsysutils/src/SocketClient.cpp
+++ b/libsysutils/src/SocketClient.cpp
@@ -1,5 +1,6 @@
 #include <alloca.h>
 #include <errno.h>
+#include <malloc.h>
 #include <pthread.h>
 #include <signal.h>
 #include <string.h>