Another hit from the exotic compiler collection: build fails on GCC 9,
from Ubuntu 20...but not later versions of GCC.
Signed-off-by: Zygo Blaxell <bees@furryterror.org>
hexdump processes a vector as a contiguous sequence of bytes, regardless
of V's value type, so hexdump should get a pointer and use uint8_t to
read the data.
Some vector types have a lock and some atomics in their operator[], so
let's avoid hammering those.
Signed-off-by: Zygo Blaxell <bees@furryterror.org>
