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Fix character list generator #1479

Job	Run time
Multiarch	0s
Bazel	0s
Windows (x64)	1m 1s
GCC, very old Autotools	1m 4s
GCC -Os, old Autotools	1m 20s
perl	19s
Windows (Win32)	1m 50s
Clang (-O2)	3m 57s
manyconfig	37m 21s
MSYS2	0s
Clang (-O0)	2m 44s
GCC -O2, old CMake	1m 34s
GCC -O0	2m 5s
GCC -Os, very old CMake, ninja, no JIT	1m 10s
CMake unity build	1m 4s
GCC -O3, CMake	1m 48s
Zig	0s
	57m 17s

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