before this change, we rely on `seastar/util/std-compat.hh` to
include the used headers provided by stdandard library. this was
necessary before we moved to a C++20 compliant standard library
implementation. but since Seastar has dropped C++17 support. its
`seastar/util/std-compat.hh` is not responsible for providing these
headers anymore.
so, in this change, we include the used headers directly instead
of relying on `seastar/util/std-compat.hh`.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closesscylladb/scylladb#18883
And a more specific HasherReturningBytes for hashers
that return bytes in finalize().
HasherReturning will be used by the following patch
also for simple hashers that return size_t from
finalize().
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
