Philippe 17/03/2021: bugfix: missing declaration in endstep

src/MNH/endstep.f90

-!MNH_LIC Copyright 1994-2020 CNRS, Meteo-France and Universite Paul Sabatier
+!MNH_LIC Copyright 1994-2021 CNRS, Meteo-France and Universite Paul Sabatier
 !MNH_LIC This is part of the Meso-NH software governed by the CeCILL-C licence
 !MNH_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt
 !MNH_LIC for details. version 1.
@@ -284,6 +284,7 @@ INTEGER:: JSV                  ! loop counters
 INTEGER :: IIB, IIE  ! index of first and last inner mass points along x
 INTEGER :: IJB, IJE  ! index of first and last inner mass points along y
 real, dimension(:,:,:), allocatable :: zrhodjontime
+real, dimension(:,:,:), allocatable :: zwork
 !
 !------------------------------------------------------------------------------
 !