Fix crash of check(solve_algo=0) under Octave

dynare_solve.m calls str2func on the function name, so it crashes if it is
passed a function handle. It needs to be passed a string.

matlab/resol.m

@@ -123,7 +123,7 @@ steady_state = oo.steady_state;
 check1 = 0;
 % testing for steadystate file
 if (~options.bytecode)
-    fh = str2func([M.fname '_static']);
+    fh = [M.fname '_static'];
 end
 
 if options.steadystate_flag