rutil: compat.hxx: add Int64

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10618 ddefafc4-47db-0310-ae44-fa13212b10f2
rutil: resipfaststreams: remove (U)Int8, add methods for (unsigned) long and Int64

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10619 ddefafc4-47db-0310-ae44-fa13212b10f2