Include configuration file to headers
Add inclusion to configration file in header files,
instead of relying on other header files to include
the configuration file. This issue resolves #1371
diff --git a/include/mbedtls/pem.h b/include/mbedtls/pem.h
index fa82f7b..a29e9ce 100644
--- a/include/mbedtls/pem.h
+++ b/include/mbedtls/pem.h
@@ -24,6 +24,12 @@
#ifndef MBEDTLS_PEM_H
#define MBEDTLS_PEM_H
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
#include <stddef.h>
/**