Distribute am2cmake.py.

[[Imported from SVN: r7374]]

bin/Makefile.am

 # $Id$
 
 # put scripts into dist-tarball
-EXTRA_DIST = CMakeLists.txt duneproject dunecontrol \
+EXTRA_DIST = am2cmake.py CMakeLists.txt duneproject dunecontrol \
   dunedoxynize \
   mpi-config dune-autogen \
   xfail-compile-tests