test(h5dump): reduce printf precision for t128bit_float
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- Dominant language
- C
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Description
`H5DUMP-t128bit_float` has a long double width portability issue (E.g., Arm64 OpenBSD).
The 80-bit (x86) and 128-bit (arm64) renderings agree to 20 sig-figs then diverge.
Possible solution: dump at %.18Lg (portable across widths, still proves long
double > double) and update the .ddl.
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