Fix missing include in non-default things
diff --git a/library/cipher_wrap.c b/library/cipher_wrap.c
index b623b3c..7b597d6 100644
--- a/library/cipher_wrap.c
+++ b/library/cipher_wrap.c
@@ -62,6 +62,10 @@
#include "polarssl/ccm.h"
#endif
+#if defined(POLARSSL_CIPHER_NULL_CIPHER)
+#include <string.h>
+#endif
+
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
diff --git a/library/md2.c b/library/md2.c
index 180a25b..43c129f 100644
--- a/library/md2.c
+++ b/library/md2.c
@@ -36,6 +36,8 @@
#include "polarssl/md2.h"
+#include <string.h>
+
#if defined(POLARSSL_FS_IO)
#include <stdio.h>
#endif