Dev

Add some real EBCDIC testing #890

Job	Run time
GCC -O0	1m 54s
GCC -Os, old Autotools	1m 2s
Clang (-O0)	2m 28s
Clang (-O2)	3m 46s
GCC -O3	59s
Windows (Win32)	2m 12s
manyconfig	11m 29s
perl	21s
CMake unity build	37s
Windows (x64)	56s
GCC -Os, CMake+ninja, no JIT	59s
Bazel	0s
EBCDIC	14s
Check autogenerated file freshness	19s
MSYS2	0s
Multiarch	0s
Zig	0s
	27m 16s

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