Update libreoffice-18.104.22.168 build for current options
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My build rejected the switch to disable gtk, it turns out that switch is no-longer offered and gtk3 is the default for linux/X. Examination, and some false-starts, led me to discover that we _can_ now link to system-icu (the shipped version is also ICU-65, my diagnosis of *why* that failed in December suggested libfreehand but apparently that wasn't the real cause), and also that we can specify PYTHON=python3 when invoking autogen.
More testing to follow before confirming.