[SuiteSparse] Fix typo in parameter name.

cmake/modules/FindSuiteSparse.cmake

@@ -219,7 +219,7 @@ set(HAVE_SUITESPARSE ${SUITESPARSE_FOUND})
 # register all SuiteSparse related flags
 if(SUITESPARSE_FOUND)
   dune_register_package_flags(
-    COMPILE_DEFINITION "ENABLE_SUITESPARSE=1"
+    COMPILE_DEFINITIONS "ENABLE_SUITESPARSE=1"
     LIBRARIES "${SUITESPARSE_LIBRARIES}"
     INCLUDE_DIRS "${SUITESPARSE_INCLUDE_DIRS}")
 endif()