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

Change-Id: I738401babffd38c241ef16e23d1b246444fd8d55
Reviewed-on: https://gerrit.libreoffice.org/10333
Reviewed-by: David Tardon <dtardon@redhat.com>
Reviewed-by: Matúš Kukan <matus.kukan@collabora.com>
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Tested-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>