[bugfix,cmake] Process dependency tree including the module itself.

One of the latest patches prevent the macros of the current module
form being executed. This patch fixes this by including the module
in the dependency tree.

cmake/modules/DuneMacros.cmake

@@ -416,7 +416,7 @@ macro(dune_module_to_macro _macro_name _dune_module)
 endmacro(dune_module_to_macro _macro_name _dune_module)
 
 macro(dune_process_dependency_tree DEPENDS DVERSIONS SUGGESTS SVERSIONS)
-  foreach(_mod ${ALL_DEPENDENCIES})
+  foreach(_mod ${ALL_DEPENDENCIES} ${ProjectName})
     if(NOT ${_mod}_PROCESSED)
       # module not processed yet
       set(${_mod}_PROCESSED ${_mod})