i18n: fix build with Boost 1.81.0

i18n: fix build with Boost 1.81.0

Boost.Locale since 1.81.0 switch to enum classes for facet type [1].
Switch our resource manager accordingly.

1: https://github.com/boostorg/locale/commit/e5ed439ea39a4de915e9fb939cca95cae7d9d8d1

Change-Id: Ief215363ceb79b2019606b20a7cde55c8df6a042
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/143343
Reviewed-by: Heiko Becker <heirecka@exherbo.org>
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
(cherry picked from commit 23dcd4339428e4080029ec5ae658e75f01e79a62)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/144310
Reviewed-by: Danh Doan <congdanhqx@gmail.com>
Tested-by: Jenkins
Gbp-Pq: Name boost-1.81.diff