externals: Update Xbyak to 5.96

I made a request on the Xbyak issue tracker to allow some constructors
to be constexpr in order to avoid static constructors from needing to
execute for some of our register constants.

This request was implemented, so this updates Xbyak so that we can make
use of it.

1 files changed, 0 insertions, 0 deletions

diff --git a/externals/xbyak b/externals/xbyak
-Subproject 18c9caaa0a3ed5706c39f5aa86cce0db6e65b17
+Subproject c306b8e5786eeeb87b8925a8af5c3bf057ff5a9