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

include/mbedtls/ssl_ciphersuites.h

@@ -24,6 +24,12 @@
 #ifndef MBEDTLS_SSL_CIPHERSUITES_H
 #define MBEDTLS_SSL_CIPHERSUITES_H
 
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
 #include "pk.h"
 #include "cipher.h"
 #include "md.h"