Add MBEDTLS_PRIVATE wrapping to sample programs.

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
diff --git a/programs/pkey/key_app_writer.c b/programs/pkey/key_app_writer.c
index 6a4d0e4..4b65262 100644
--- a/programs/pkey/key_app_writer.c
+++ b/programs/pkey/key_app_writer.c
@@ -335,10 +335,10 @@
         if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_ECKEY )
         {
             mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( key );
-            mbedtls_mpi_write_file( "Q(X): ", &ecp->Q.X, 16, NULL );
-            mbedtls_mpi_write_file( "Q(Y): ", &ecp->Q.Y, 16, NULL );
-            mbedtls_mpi_write_file( "Q(Z): ", &ecp->Q.Z, 16, NULL );
-            mbedtls_mpi_write_file( "D   : ", &ecp->d  , 16, NULL );
+            mbedtls_mpi_write_file( "Q(X): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(X), 16, NULL );
+            mbedtls_mpi_write_file( "Q(Y): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Y), 16, NULL );
+            mbedtls_mpi_write_file( "Q(Z): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Z), 16, NULL );
+            mbedtls_mpi_write_file( "D   : ", &ecp->MBEDTLS_PRIVATE(d)  , 16, NULL );
         }
         else
 #endif
@@ -389,9 +389,9 @@
         if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_ECKEY )
         {
             mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( key );
-            mbedtls_mpi_write_file( "Q(X): ", &ecp->Q.X, 16, NULL );
-            mbedtls_mpi_write_file( "Q(Y): ", &ecp->Q.Y, 16, NULL );
-            mbedtls_mpi_write_file( "Q(Z): ", &ecp->Q.Z, 16, NULL );
+            mbedtls_mpi_write_file( "Q(X): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(X), 16, NULL );
+            mbedtls_mpi_write_file( "Q(Y): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Y), 16, NULL );
+            mbedtls_mpi_write_file( "Q(Z): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Z), 16, NULL );
         }
         else
 #endif