Merge branch 'thoennes/fix-metis-cmake-warning' into 'master'

recent versions of cmake warn if the argument is not the same as the FindXXX.cmake name

See merge request walberla/walberla!483

cmake/FindMetis.cmake

@@ -161,7 +161,7 @@ else(METIS_LIBRARIES AND METIS_INCLUDE_DIRS)
 endif(METIS_LIBRARIES AND METIS_INCLUDE_DIRS )   
 
 # Send useful message if everything is found
-find_package_handle_standard_args(METIS DEFAULT_MSG
+find_package_handle_standard_args(Metis DEFAULT_MSG
                                   METIS_LIBRARIES
                                   METIS_INCLUDE_DIRS)