Correction to CI config for autogenerated file freshness #873

Job	Run time
GCC -O0	1m 55s
GCC -O3	57s
Windows (Win32)	2m 8s
manyconfig	24m 21s
perl	18s
CMake unity build	46s
GCC -Os, old Autotools	58s
Clang (-O0)	2m 32s
Multiarch	0s
Clang (-O2)	3m 40s
Windows (x64)	1m 50s
GCC -Os, CMake+ninja, no JIT	2m 3s
Bazel	0s
Check autogenerated file freshness	18s
MSYS2	0s
Zig	0s
	41m 46s

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