Fix autoconf warnings#380

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notroj wants to merge 7 commits intoapache:trunkfrom

notroj:autoconf-warnings

Commits on Feb 14, 2025

autoconf: Use AS_HELP_STRING if available, fixes warnings for any recent
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configure: Fix autoconf warnings.
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* acinclude.m4 (APACHE_CHECK_OPENSSL): Use AC_CACHE_CHECK/AC_COMPILE_IFELSE
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* os/unix/config.m4: Move check for rlim_t here and use AC_CHECK_TYPE.
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* configure.in: Use AC_CHECK_MEMBER for struct tm.tm_gmtoff test.
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* buildconf: Run autoconf with -Wall -Wno-cross to suppress
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CI: Add workflow to fail if autoconf/autoheader warnings are produced.
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