rdf4h.cabal: drop unused hpc and tests flags
rdf4h.cabal: drop unused hpc and tests flags

Signed-off-by: Sergei Trofimovich <df7d2cee2e7ececeb2368216a0f9d0537fd32149@google.com>

cordawyn/rdf4h,jutaro/rdf4h,ddssff/rdf4h