Dev

Add some real EBCDIC testing #889

Job	Run time
GCC -O0	32s
GCC -Os, old Autotools	27s
Clang (-O0)	24s
GCC -O3	54s
GCC -Os, CMake+ninja, no JIT	1m 3s
Windows (Win32)	1m 31s
Clang (-O2)	1m 59s
manyconfig	50s
perl	18s
CMake unity build	35s
Windows (x64)	1m 58s
Bazel	0s
EBCDIC	10s
Check autogenerated file freshness	19s
MSYS2	0s
Multiarch	0s
Zig	0s
	11m 0s

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