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Fix character list generator #1480

Job	Run time
Clang (-O0)	2m 43s
GCC -Os, old Autotools	1m 19s
GCC -O0	2m 8s
GCC -Os, very old CMake, ninja, no JIT	1m 8s
Clang (-O2)	3m 51s
GCC -O3, CMake	1m 41s
GCC -O2, old CMake	1m 47s
GCC, very old Autotools	1m 8s
Windows (Win32)	2m 49s
Windows (x64)	1m 20s
CMake unity build	49s
manyconfig	37m 17s
Bazel	0s
perl	22s
MSYS2	0s
Zig	0s
Multiarch	0s
	58m 22s

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