[cleanup] Remove two remaining Makefile.am's

cmake/modules/Makefile.am

-MODULES = \
-  AddGMPFlags.cmake        \
-  AddMETISFlags.cmake      \
-  AddParMETISFlags.cmake   \
-  AddPTScotchFlags.cmake   \
-  AddUMFPackFlags.cmake    \
-  CheckCXXFeatures.cmake   \
-  DuneCommonMacros.cmake  \
-  DuneCxaDemangle.cmake   \
-  DuneDoc.cmake           \
-  DuneDoxygen.cmake       \
-  DuneEnableAllPackages.cmake \
-  DuneMacros.cmake        \
-  DuneMPI.cmake           \
-  DunePkgConfig.cmake     \
-  DuneStreams.cmake       \
-  DuneSymlinkOrCopy.cmake \
-  DuneTestMacros.cmake    \
-  FindGMP.cmake           \
-  FindInkscape.cmake      \
-  FindMETIS.cmake         \
-  FindMProtect.cmake      \
-  FindParMETIS.cmake      \
-  FindPTScotch.cmake      \
-  FindThreadsCMake31.cmake \
-  FindUMFPack.cmake       \
-  Headercheck.cmake       \
-  LanguageSupport.cmake   \
-  OverloadCompilerFlags.cmake \
-  UseInkscape.cmake       \
-  UseLATEX.cmake
-
-TESTPROGRAMS = CheckForPthreads.c
-
-modulesdir = $(datadir)/dune/cmake/modules
-dist_modules_DATA = ${MODULES} ${TESTPROGRAMS}
-
-include $(top_srcdir)/am/global-rules
-EXTRA_DIST = CMakeLists.txt

cmake/scripts/Makefile.am

-MODULES = \
-  CreateDoxyFile.cmake        \
-  FinalizeHeadercheck.cmake   \
-  InstallFile.cmake           \
-  RunDoxygen.cmake
-
-modulesdir = $(datadir)/dune/cmake/scripts
-dist_modules_DATA = ${MODULES}
-
-include $(top_srcdir)/am/global-rules
-EXTRA_DIST = CMakeLists.txt