Add infrastructure for ecdsa_verify_restartable()
diff --git a/library/ecp.c b/library/ecp.c
index 9d4721e..40daa67 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -101,6 +101,14 @@
 }
 
 /*
+ * Check if restart is enabled
+ */
+int mbedtls_ecp_restart_enabled( void )
+{
+    return( ecp_max_ops != 0 );
+}
+
+/*
  * Restart sub-context for ecp_mul_comb()
  */
 struct mbedtls_ecp_restart_mul