BUILD: ssl: next round of build warnings on LIBRESSL_VERSION_NUMBER

Other build warnings were emitted on LIBRESSL_VERSION_NUMBER with -Wundef
under openssl < 1.1. Related to GH issue #1369. Seems like some of them
could be simplified a little bit.

(cherry picked from commit ea57a9b103f8a9e8e7a5d0cc5b03fa8ba59543a8)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed