vt: create ucs_fallback_table.h_shipped with gen_ucs_fallback_table.py

The generated table maps complex characters to their simpler fallback
forms for a terminal display when corresponding glyphs are unavailable.
A page-based approach is used to reduce compiled binary footprint.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Link: https://lore.kernel.org/r/20250507141535.40655-6-nico@fluxnic.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>