[cleanup] Remove enable trick for UMFPack

cmake/modules/AddUMFPackFlags.cmake

-# module providing convenience mehtods for compiling bianries with UMFPack support
+# module providing convenience methods for compiling
+# binaries with UMFPack support
 #
 # Provides the following functions:
 #
@@ -12,7 +13,7 @@ function(add_dune_umfpack_flags _targets)
       get_target_property(_props ${_target} COMPILE_FLAGS)
       string(REPLACE "_props-NOTFOUND" "" _props "${_props}")
       set_target_properties(${_target} PROPERTIES COMPILE_FLAGS
-        "${_props} ${UMFPACK_DUNE_COMPILE_FLAGS} -DENABLE_UMFPACK")
+        "${_props} ${UMFPACK_DUNE_COMPILE_FLAGS}")
     endforeach(_target ${_targets})
   endif(UMFPACK_FOUND)
-endfunction(add_dune_umfpack_flags)
+endfunction(add_dune_umfpack_flags)
\ No newline at end of file

cmake/modules/FindUMFPack.cmake

@@ -96,7 +96,7 @@ set(HAVE_UMFPACK ${UMFPACK_FOUND})
 
 # register all umfpack related flags
 if(UMFPACK_FOUND)
-  dune_register_package_flags(COMPILE_DEFINITIONS "ENABLE_UMFPACK=1"
-                            LIBRARIES "${UMFPACK_LIBRARIES}"
-                            INCLUDE_DIRS "${UMFPACK_INCLUDE_DIRS}")
+  dune_register_package_flags(
+    LIBRARIES "${UMFPACK_LIBRARIES}"
+    INCLUDE_DIRS "${UMFPACK_INCLUDE_DIRS}")
 endif()

config.h.cmake

@@ -107,8 +107,8 @@
 /* does the compiler support the keyword 'final'? */
 #cmakedefine HAVE_KEYWORD_FINAL 1
 
-/* Define to if the UMFPack library is available */
-#cmakedefine HAVE_UMFPACK ENABLE_UMFPACK
+/* Define to 1 if the UMFPack library is available */
+#cmakedefine HAVE_UMFPACK 1
 
 /* Define to ENABLE_PARMETIS if you have the Parmetis library.
    This is only true if MPI was found