hsc2hs: Update submodule

This makes sure the --cross-compile mode can handle negative enum
values.

Differential Revision: https://phabricator.haskell.org/D301Signed-off-by: Austin Seipp <austin@well-typed.com>

hsc2hs @ 10696fe1

-Subproject commit 286dd5d6bf83115404ec6e9e194711554390e976
+Subproject commit 10696fe17c9d2b4e3498684c6ffbd9f44eda53c4