Reduce code size when mbedtls_x509_*_info() unused

Introduce MBEDTLS_X509_INFO to indicate the availability of the
mbedtls_x509_*_info() function and closely related APIs. When this is
not defined, also omit name and description from
mbedtls_oid_descriptor_t, and omit OID arrays, macros, and types that
are entirely unused. This saves several KB of code space.

Change-Id: I056312613379890e0d70e1d08c34171287c0aa17
diff --git a/programs/ssl/query_config.c b/programs/ssl/query_config.c
index be35a76..b9070c8 100644
--- a/programs/ssl/query_config.c
+++ b/programs/ssl/query_config.c
@@ -1482,6 +1482,14 @@
     }
 #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
 
+#if defined(MBEDTLS_X509_INFO)
+    if( strcmp( "MBEDTLS_X509_INFO", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_X509_INFO );
+        return( 0 );
+    }
+#endif /* MBEDTLS_X509_INFO */
+
 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
     if( strcmp( "MBEDTLS_X509_RSASSA_PSS_SUPPORT", config ) == 0 )
     {