The curses interface was using genl_putmixed() which doesn't
preserve the symbol actually used for a glyph on the display.
This is a first-attempt at implementing curses_putmixed().
On Linux you'll need to distribute the Makefiles again
sh sys/unix/setup.sh sys/unix/hints/linux.370
On macOS, you'll need to distribute the Makefiles again
sh sys/unix/setup.sh sys/unix/hints/macOS.370
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