clean up Makefile.am's

dune/alugrid/src/duneinterface/Makefile.am

-# Makefile.am for distributing all cc-files
-AUTOMAKE_OPTIONS = foreign 1.5
-
 EXTRA_DIST = gitter_dune_impl.cc  gitter_dune_pll_impl.cc

dune/alugrid/src/parallel/Makefile.am

-# Makefile.am for distributing all cc-files
-AUTOMAKE_OPTIONS = foreign 1.5
-
 EXTRA_DIST = gitter_pll_idn.cc   gitter_pll_ldb.cc  gitter_pll_sti.cc\
 mpAccess_MPI.cc  mpAccess_STAR.cc  gitter_pll_impl.cc  gitter_pll_mgb.cc  mpAccess.cc \
 gitter_hexa_top_pll.cc gitter_tetra_top_pll.cc

dune/alugrid/src/serial/Makefile.am

-# Makefile.am for distributing all cc-files
-AUTOMAKE_OPTIONS = foreign 1.5
-
 EXTRA_DIST = gitter_geo.cc  gitter_impl.cc  gitter_mgb.cc  gitter_sti.cc  mapp_cube_3d.cc\
 mapp_tetra_3d.cc  myalloc.cc  ghost_elements.cc ghost_info.cc \
 gitter_hexa_top.cc gitter_tetra_top.cc