parlatype: remove libreoffice build option
parlatype: remove libreoffice build option

Fixes build with meson 0.60.
The libreoffice extension was moved to its own repository in
https://github.com/gkarsay/parlatype/commit/14386d24e50276fb91157301f3b4ab86214288ad
so there's no need to disable it.

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