fdo#80363 always use WIN32 long path prefix with Hunspell, MyThes, Hyphen

Change-Id: I738401babffd38c241ef16e23d1b246444fd8d55
Reviewed-on: https://gerrit.libreoffice.org/10328
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>