Fix wrong code generation if EN/ENO are used in FBD/LD/SFC

This problem appears for example here

--------
------- | MOVE |
| MOVE1 |------|EN ENO|
------- | |
| |
------- | | -----------
| 23 |------|IN OUT|---| LocalVar0 |
------- -------- -----------


--------
------- | MOVE |
| MOVE2 |------|EN ENO|
------- | |
| |
------- | | -----------
| 15 |------|IN OUT|---| LocalVar0 |
------- -------- -----------

Before wrong code was generated for this case:

MOVE6_OUT := MOVE(EN := move1, IN := 23, ENO => MOVE6_ENO);
LocalVar0 := MOVE6_OUT;
MOVE4_OUT := MOVE(EN := move2, IN := 15, ENO => MOVE4_ENO);
LocalVar0 := MOVE4_OUT;

With this patch now following code is generated:

MOVE6_OUT := MOVE(EN := move1, IN := 23, ENO => MOVE6_ENO);
IF MOVE6_ENO THEN
LocalVar0 := MOVE6_OUT;
END_IF;
MOVE4_OUT := MOVE(EN := move2, IN := 15, ENO => MOVE4_ENO);
IF MOVE4_ENO THEN
LocalVar0 := MOVE4_OUT;
END_IF;


See discussion here:
https://sourceforge.net/p/beremiz/mailman/message/36378805/

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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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#

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# See COPYING.Runtime file for copyrights details.

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#

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from __future__ import absolute_import

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from ctypes import CDLL, RTLD_GLOBAL, pointer, c_int, POINTER, c_char, create_string_buffer

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    10

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def TryPreloadXenomai():

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    """

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    Xenomai 3 (at least for version <= 3.0.6) do not handle properly dlclose

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    of shared objects whose dlopen did trigger xenomai_init.

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    As a workaround, this pre-loads xenomai libraries that need to be

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    initialized and call xenomai_init once for all.

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    Xenomai auto init of libs MUST be disabled (see --auto-init-solib in xeno-config)

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    """

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    try:

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        for name in ["cobalt", "modechk", "copperplate", "alchemy"]:

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            globals()[name] = CDLL("lib"+name+".so", mode=RTLD_GLOBAL)

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        cobalt.xenomai_init(pointer(c_int(0)), pointer((POINTER(c_char)*2)(create_string_buffer("prog_name"), None)))

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    except Exception:

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        pass