Update autoconf config for modern toolchain in preparation for release 1.9.6#44

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royhills wants to merge 10 commits intomasterfrom support-modern-toolchain

+571-2,118

Commits on Sep 15, 2024

Put autoconf build tools in "build-aux". Require autoconf 2.69 or later.
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Require C99 compliant C compiler
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Unconditionally include C89 & C99 standard headers and remove configure checks.
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Removed sys/types.h include as required types should be in POSIX.1 unistd.h.
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Use B .Sittler's getopt implementation for systems lacking getopt_long_only.
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Use C99 fixed width integer types and formats instead of defining our own.
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Removed depreciated --enable-lookup configure option.
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Move local autoconf macros from acinclude.m4 to seperate files under m4 directory
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Renamed autoconf macro ac-nta-net-size-t to ike-net-size-t
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Add -Wextra and -Wformat-security options to CFLAGS without autoconf tests.
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