tests/ep/rbcii.mod: use supported mechanism for user-provided steady state file

Incidentally, this should fix random crashes under Octave (where the manually
copied steady state file was not correctly detected by the interpreter).

(cherry picked from commit d62a09cd)

tests/.gitignore

@@ -48,7 +48,7 @@ wsOct
 !/ep/ar_steadystate.m
 !/ep/exact_solution.m
 !/ep/mean_preserving_spread.m
-!/ep/rbcii_steady_state.m
+!/ep/rbcii_steadystate.m
 !/estimation/fsdat_simul.m
 !/estimation/method_of_moments/AnScho/AnScho_MoM_data_2.mat
 !/estimation/method_of_moments/RBC/RBC_MoM_steady_helper.m

tests/ep/rbcii.mod

@@ -54,10 +54,6 @@ model(use_dll);
 
 end;
 
-// Write analytical steady state file (without globals)
-options_.steadystate_flag = 2;
-copyfile('rbcii_steady_state.m','+rbcii/steadystate.m');
-
 @#if extended_path_version
 
     shocks;

tests/ep/rbcii_steady_state.m → tests/ep/rbcii_steadystate.m

-function [ys_, params, info] = rbcii_steadystate2(ys_, exo_, params)
+function [ys_, params, info] = rbcii_steadystate(ys_, exo_, M_, options_)
      
+    params = M_.params;
+
     % Flag initialization (equal to zero if the deterministic steady state exists) 
     info = 0;
     
@@ -85,4 +87,4 @@ function [labour,info] = l_solver(labour,alpha,psi,theta,effstar,kstar,maxiter)
         condition = abs(r)>1e-9;
         iteration = iteration + 1; 
     end
-end
\ No newline at end of file
+end