Introduced POLARSSL_HAVE_READDIR_R for systems without it

include/polarssl/config.h

@@ -93,6 +93,17 @@
 #define POLARSSL_HAVE_SSE2
  */
 
+/**
+ * \def POLARSSL_HAVE_READDIR_R
+ *
+ * (Non Windows) System has readdir_r().
+ *
+ * Required for x509_crt_parse_path() in non-Windows systems.
+ *
+ * Comment if your system does not have support.
+ */
+#define POLARSSL_HAVE_READDIR_R
+
 /**
  * \def POLARSSL_HAVE_TIME
  *