Fix chmod error at configure

When configure was launched at first time (an empty build folder), the
following message where displayed:
chmod: cannot access 'tools/starpu_trace_state_stats.py': No such file or directory

configure.ac

@@ -3575,7 +3575,6 @@ AC_CONFIG_COMMANDS([executable-scripts], [
   chmod +x tools/starpu_smpirun
   chmod +x doc/doxygen/doxygen_filter.sh
   chmod +x doc/doxygen_dev/doxygen_filter.sh
-  chmod +x tools/starpu_trace_state_stats.py
   chmod +x starpupy/examples/execute.sh
   for x in starpupy/examples/starpu_py.sh starpupy/examples/starpu_py_np.sh starpupy/examples/starpu_py_parallel.sh; do
       test -e $x || mkdir -p $(dirname $x) && ln -sf $ac_abs_top_srcdir/$x $(dirname $x)