erts: Add configure test for getauxval(3)

[jhogberg]

Adds configure test that was missing from #11249, breaking some cross-builds.

[github-actions]

CT Test Results

    3 files    136 suites   53m 29s ⏱️
1 682 tests 1 626 ✅ 56 💤 0 ❌
2 325 runs  2 251 ✅ 74 💤 0 ❌

Results for commit 858db8f.

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// Erlang/OTP Github Action Bot

[Copilot]

Pull request overview

Adds a configure-time capability check for getauxval(3) and wires it into the JIT alternate signal-stack sizing logic, addressing cross-build failures introduced by #11249 when <sys/auxv.h> / getauxval aren’t available in the target sysroot.

Changes:

• Gate sys_signal_stack.c’s <sys/auxv.h> include and getauxval(AT_MINSIGSTKSZ) usage behind HAVE_GETAUXVAL.
• Add an Autoconf probe intended to detect getauxval availability and define HAVE_GETAUXVAL.
• Update generated erts/configure and erts/config.h.in accordingly.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
erts/emulator/sys/unix/sys_signal_stack.c	Uses HAVE_GETAUXVAL to conditionally include <sys/auxv.h> and size the alt signal stack via AT_MINSIGSTKSZ.
erts/configure.ac	Adds a configure check intended to detect getauxval and define HAVE_GETAUXVAL.
erts/configure	Regenerated configure script reflecting the new check.
erts/config.h.in	Adds #undef HAVE_GETAUXVAL template for config header generation.

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