external modules with a gateway can no longer be loaded

Reported by Samuel GOUGEON (@sgougeon)

BUG DESCRIPTION:
----------------
external modules with a gateway can no longer be loaded

ERROR LOG:
----------
 Start Metanet
	Load macros
	Load gateways
./../src/c/libmetanet_c' + getdynlibext())
                                           !--error 236 
link : La bibliothèque partagée n'a pas été chargée: Unknown Error
at line      19 of exec file called by :    
    exec("loader.sce");
at line      20 of exec file called by :    

at line      33 of function startModule called by :  
[metanetgraph_toolslib, metaneteditorlib, metanetlib] = startModule();
at line      72 of exec file called by :    
exec(get_absolute_file_path("loader.sce")+"etc\"+"metanet.start");
at line      10 of exec file called by :    
51008\contrib\metanet\0.5-2\\loader.sce")
in  execstr instruction    called by :  
:13f2563006e:-7fa2");execstr(toolboxes(2));if exists("%oldgcbo") then gcbo = %oldgcb
while executing a callback

-----------------------------

 Start SciFreeFEM toolbox   
 Load macros   
 Load gateways   

tdynlibext(), 'freefem_c', list_functions)
                                           !--error 236 
addinter : La bibliothèque partagée n'a pas été chargée: Le module spécifié est introuvable.

at line      27 of exec file called by :    
    exec("loader.sce");
at line      20 of exec file called by :    
exec( root_tlbx + '/sci_gateway/loader_gateway.sce' );
at line      29 of exec file called by :    
exec(get_absolute_file_path("loader.sce")+"etc\"+"SciFreeFEM.start");
at line      10 of exec file called by :    
08\contrib\SciFreeFEM\1.3-1\\loader.sce")
in  execstr instruction    called by :  
:13f2563006e:-7fa3");execstr(toolboxes(1));if exists("%oldgcbo") then gcbo = %oldgcb
while executing a callback


HOW TO REPRODUCE THE BUG:
-------------------------
// Metanet being installed:
atomsLoad metanet


OTHER INFORMATION:
------------------
Same problem for all modules tested.

-->[v,o] = getversion()
 o  =
!ICC  x64  tk  modelicac  release  Jun  5 2013  01:07:09  !
 v  =
 scilab-master-1370351008