Log Message:
x11/xterm: update to 348

Patch #384 - 2023/07/10
 - exclude ASCII space from showMissingGlyphs, since a few bitmap fonts lack
   this (report by "SanRemo", Emanuel Haupt).
 - correct a step in rendering double-width characters with bitmap-fonts
   (report by Peter Fabinski, Debian #1039986).
 - fixes for ReGIS-related problems (report by Ben Wong):
    - mimic an undocumented hardware VT340 feature which handles color
      initialization with incomplete parameters.
    - handle whitespace between operator/operands for color values.
    - reset ReGIS-context when resetting graphics in RIS.