bug fix, did not compile with IBM xlC 8.0

[[Imported from SVN: r5012]]

m4/dune.m4

@@ -232,7 +232,7 @@ AC_DEFUN([DUNE_CHECK_DISPATCH],[
          [$1], [dune-grid],[
            DUNE_CHECK_MODULES([dune-grid], [grid/common/grid.hh], [Dune::PartitionName])],
          [$1], [dune-fem],[
-           DUNE_CHECK_MODULES([dune-fem], [fem/space/basefunctions/storageinterface.hh], [main] )],
+           DUNE_CHECK_MODULES([dune-fem], [fem/space/basefunctions/storageinterface.hh], [] )],
          [$1], [dune-istl],[
            DUNE_CHECK_MODULES([dune-istl], [istl/allocator.hh])],
          [$1], [dune-disc],[