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configure: drop unused detections and macros #15867

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  • drop HAVE_IOCTL macro, drop exception.
  • drop unused setjmp.h detection, drop exception.
    It's a C89 header and result also not used in detections.
  • use C89 stdlib.h without detection.
    (It's still being detected by autotools anyway.)

It's used like this in the source.

stdlib.h is detected by autotools anyway. We avoid a second,
explicit check which uses the cached result of the implicit
check. The HAVE macor is set either way.
@github-actions github-actions bot added the CI Continuous Integration label Dec 30, 2024
@vszakats vszakats closed this in f60f872 Dec 31, 2024
@vszakats vszakats deleted the configure-tidy-ups branch December 31, 2024 10:38
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