[bug #66675] [troff] valid .char definition starting with `\[u` provokes erroneous error

Update of bug #66675 (group groff): Severity: 3 - Normal => 5 - Blocker ___ Reply to this item at: ___ Message sent via Sav

[bug #66686] \w rejecting delimiter roffs have accepted for decades

Update of bug #66686 (group groff): Severity: 3 - Normal => 5 - Blocker ___ Reply to this item at: ___ Message sent via Sav