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Fix character list generator #1481

Job	Run time
Clang (-O2)	4m 5s
GCC -Os, old Autotools	1m 12s
Clang (-O0)	2m 56s
GCC -O3, CMake	1m 39s
CMake unity build	49s
manyconfig	38m 30s
GCC -O0	2m 14s
GCC, very old Autotools	1m 3s
perl	23s
GCC -O2, old CMake	1m 38s
GCC -Os, very old CMake, ninja, no JIT	1m 7s
Windows (x64)	1m 1s
Windows (Win32)	1m 49s
Multiarch	0s
Bazel	0s
Zig	0s
MSYS2	0s
	58m 26s

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