Fix build system with Automake 1.12

.gitignore

configure.ac

mex/build/bytecode.am

mex/build/dynare_simul_.am

mex/build/estimation.am

mex/build/gensylv.am

mex/build/k_order_perturbation.am

mex/build/kalman_steady_state.am

mex/build/libdynare++.am

mex/build/matlab/configure.ac

mex/build/matlab/mex.am

mex/build/ms_sbvar.am

mex/build/octave/configure.ac

mex/build/octave/mex.am

mex/build/octave/ms_sbvar/Makefile.am