[bugfix] Remove duplicated add_subdirectory calls.

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@15350 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/CMakeLists.txt

@@ -9,14 +9,3 @@ add_subdirectory("material")
 add_subdirectory("multidomain")
 add_subdirectory("nonlinear")
 add_subdirectory("parallel")
-add_subdirectory("common")
-add_subdirectory("decoupled")
-add_subdirectory("freeflow")
-add_subdirectory("geomechanics")
-add_subdirectory("implicit")
-add_subdirectory("io")
-add_subdirectory("linear")
-add_subdirectory("material")
-add_subdirectory("multidomain")
-add_subdirectory("nonlinear")
-add_subdirectory("parallel")