main: extend CPU feature check to verify that PCLMUL is available
main: extend CPU feature check to verify that PCLMUL is available

Since 79136e895f1f77b93ec93b36c3abb1e8863b5718, we use the pclmul instruction set,
so check it is there.

scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla