Deprecate CONF_modules_free() and make it a no-op

CONF_modules_free() should not be called expicitly - we should leave
auto-deinit to clean this up instead.

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

include/internal/conf.h

@@ -53,6 +53,7 @@ struct ossl_init_settings_st {
 
 void openssl_config_internal(const char *config_name);
 void openssl_no_config_internal(void);
+void conf_modules_free_intern(void);
 
 #ifdef __cplusplus
 }