autoconf: fix some "obsolete function" warnings with newer (2.7x) autoconfs
We also now require at least autoconf 2.69 - which should be fine as it was released in 2012.
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@@ -294,7 +294,7 @@ if test "x$ax_pthread_clang" = "xyes"; then
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# step
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ax_pthread_save_ac_link="$ac_link"
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ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
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ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
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ax_pthread_link_step=`echo "$ac_link" | sed "$ax_pthread_sed"`
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ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
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ax_pthread_save_CFLAGS="$CFLAGS"
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for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
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