JSON/WKT: avoid precision issues on non-Intel architectures on coordinate epochs (fixes #3632)

[rouault]

@sebastic does it help?

[sebastic]

Thanks for the quick action.

Unfortunately the tests still fail the same way with the changes from this PR, see:

https://buildd.debian.org/status/package.php?p=proj&suite=experimental

[rouault]

Unfortunately the tests still fail the same way with the changes from this PR, see:

hum, weird. Oh well I've added 7b0af47 that should hopefully avoid the issue...

[sebastic]

Build now succeeded on armel, armhf, and mipsel, but still failed on mips64el:

55: ./test/unit/gie_self_tests.cpp:1238: Failure
55: The difference between output_over_normalized.xyz.x and -24490287.974520184 is nan, which exceeds 1e-8, where
55: output_over_normalized.xyz.x evaluates to nan,
55: -24490287.974520184 evaluates to -24490287.974520184, and
55: 1e-8 evaluates to 1e-08.
55: [  FAILED  ] gie.proj_create_crs_to_crs_from_pj_force_over (557 ms)

[rouault]

@sebastic Perhaps fa8f46c will help for the mips64el failure ?

[sebastic]

Thanks, the build now also succeeded on mips64el:

https://buildd.debian.org/status/package.php?p=proj&suite=experimental