Move the find_package(SuiteSparse) from istl to common
Summary
Move the find_package call into DuneCommonMacros.cmake (dune-common), since the defines #HAVE_SUITESPARSE_XYZ are in dune-common.
See associated MR in dune-common!1284 (merged).
Move the find_package call into DuneCommonMacros.cmake (dune-common), since the defines #HAVE_SUITESPARSE_XYZ are in dune-common.
See associated MR in dune-common!1284 (merged).