Revert "[cmake] Activate test for METIS and use it where appropriate."

This reverts commit 901b5954.
It (METIS) does not seem needed for compilation and the patch
forced the user and downstream modules to add additional compile
 and linker flags.

cmake/modules/DuneIstlMacros.cmake

 find_package(BoostFusion)
 find_package(METIS)
-include(AddMETISFlags)
 find_package(ParMETIS)
 include(AddParMETISFlags)
 find_package(SuperLU)

config.h.cmake

@@ -39,9 +39,6 @@
    by configure _and_ if the application uses the PARMETIS_CPPFLAGS */
 #cmakedefine HAVE_PARMETIS ENABLE_PARMETIS
 
-/* Define if you have METIS library */
-#cmakedefine HAVE_METIS 1
-
 /* Define to ENABLE_SUPERLU if the SuperLU library is available */
 #cmakedefine HAVE_SUPERLU ENABLE_SUPERLU
 

dune/istl/paamg/test/CMakeLists.txt

@@ -99,6 +99,5 @@ foreach(_exe ${ALLTESTS})
   add_test(${_exe} ${_exe})
 endforeach(_exe ${ALLTESTS})
 
-add_dune_parmetis_flags("${PARMETISTESTS}")
-add_dune_metis_flags("${PARMETISTESTS}")
 add_dune_mpi_flags("${MPITESTS}")
+add_dune_parmetis_flags("${PARMETISTESTS}")

dune/istl/test/CMakeLists.txt

@@ -114,7 +114,6 @@ if(HAVE_MPI)
   add_executable(matrixmarkettest "matrixmarkettest.cc")
   add_dune_mpi_flags("${MPITESTS}")
   add_dune_parmetis_flags(matrixredisttest)
-  add_dune_metis_flags(matrixredisttest)
 endif(HAVE_MPI)
 
 foreach(_exe ${ALLTESTS})