x11/xterm: update to 378

Patch #378 - 2023/01/09

- improve descriptions of XTQMODKEYS and XTQALLOWED features in ctlseqs.ms
  (reports by Bram Moolenaar, Thomas Wolff).
- add bracketed+paste and report+version building blocks to terminfo, from
  ncurses 6.4
- improve check for unsupported formatting characters, e.g., zero-width space,
  to properly ignore them (report by Thomas Wolff).
- improve/document error-checking for some of the controls which return
  responses: DECRQSS, XTGETXRES, XTSETTCAP, XTGETTCAP (prompted by discussion
  with David Leadbeater).
- improve limit-checks for fallback font cache (report by Dimitrije Erdeljan).
- improve check for too-wide glyph in fallback font by allowing xterm to
  continue searching for a suitable font rather than just failing on the first.
  Also add limitFontWidth to allow changing the amount by which a glyph must
  extend outside the font's bounding box to disallow it.


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