From aac152328d5bcc837bafb80d3be72ef030e7f710 Mon Sep 17 00:00:00 2001
From: Simon Butcher <simon.butcher@arm.com>
Date: Mon, 10 Oct 2016 23:23:41 +0100
Subject: [PATCH] Add extra compilation conditions to X.509 samples

The sample applications programs/pkey/cert_req.c and
programs/pkey/cert_write.c use the library functions mbedtls_pk_write_csr_pem()
and mbedtls_pk_write_crt_pem() respectively and programs/pkey/gen_key.c uses
the library function mbedtls_pk_write_key_pem().

These are dependent on the configuration option POLARSSL_PEM_WRITE_C. If the
option isn't defined the build breaks.

This change adds the compilation condition POLARSSL_PEM_WRITE_C to these
sample applications.