[Merge][CMake] Merged revisions : 6676

Revision  r6676
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trick cmake to use the current source path when compiling and not the
one when this directive is processed.

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[[Imported from SVN: r7203]]

cmake/modules/DuneMacros.cmake

@@ -148,6 +148,7 @@ macro(dune_project)
   include_directories("${CMAKE_SOURCE_DIR}")
   link_directories("${CMAKE_SOURCE_DIR}/lib")
   include_directories("${CMAKE_CURRENT_BINARY_DIR}")
+  include_directories("/\${CMAKE_CURRENT_SOURCE_DIR}")
   add_definitions(-DHAVE_CONFIG_H)
 
   # Search for MPI and set the relevant variables.