8bc946c148b3e3321e23bfbace19c91feb2893dc preprocessor: replace extra exos in steady state model (commit lost in merge) (cherry picked from commit d7db5070e7cf8d1b043062b04d3bd3c4e18ce6c1)

================================ DYNARE MAKE CHECK MATLAB RESULTS ================================ | TOTAL: 529 | PASS: 524 | FAIL: 2 | XFAIL: 3 | XPASS: 0 | LIST OF FAILED TESTS: | * estimation/MH_recover/fs2000_recover.mod | * identification/rbc_ident/rbc_ident_varexo_only.mod

================================ DYNARE MAKE CHECK OCTAVE RESULTS ================================ | TOTAL: 523 | PASS: 512 | FAIL: 8 | XFAIL: 3 | XPASS: 0 | LIST OF FAILED TESTS: | * estimation/MH_recover/fs2000_recover.mod | * gsa/cod_ML_morris/cod_ML_morris.mod | * steady_state/walsh1_ssm.mod | * kalman_filter_smoother/algo4.mod | * shock_decomposition/fs2000_est.mod | * optimizers/fs2000_7.mod | * ../matlab/lyapunov_symm.m#1 | * ../matlab/modules/dseries/src/@dseries/dseries.m#5

A full log can be found at http://www.dynare.org/testsuite/master