IMPORT: xxhash: update xxHash to version 0.8.2

Peter Varkoly reported a build issue on ppc64le in xxhash.h. Our version
(0.8.1) was the last one 9 months ago, and since then this specific issue
was addressed in 0.8.2, so let's apply the maintenance update.

This should be backported to 2.8 and 2.7.

(cherry picked from commit 9b47ed1a933f89cc14ad145442e6166d9ae7ffea)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed