[CMake] move the cmakedefine for UMFPack to dune-common

The config.h entry for ENABLE_UMFPACK should be in the same module
as the test for UMFPack, to avoid future conflicts with multiple
modules running the test for umfpack.

config.h.cmake

@@ -42,9 +42,6 @@
 /* Define to ENABLE_SUPERLU if the SuperLU library is available */
 #cmakedefine HAVE_SUPERLU ENABLE_SUPERLU
 
-/* Define to if the UMFPack library is available */
-#cmakedefine HAVE_UMFPACK ENABLE_UMFPACK
-
 /* define to 1 because older versions of SuperLU are no longer supported*/
 #define SUPERLU_POST_2005_VERSION 1