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- update `AC_HELP_STRING' to 'AS_HELP_STRING`: ``` configure.ac:[...]: warning: The macro `AC_HELP_STRING' is obsolete. ``` "AC_HELP_STRING is deprecated in 2.70+ and I believe AS_HELP_STRING works already since 2.59 so bump the minimum required version to that." Ref:a59f046116- simplify to avoid: ``` src/Makefile.inc:48: warning: variable 'EXTRA_DIST_SOURCES' is defined but no program or src/Makefile.inc:48: library has 'DIST' as canonical name (possible typo) ``` Regression from2c18b6fc8d- `AC_TRY_LINK`/`AC_TRY_COMPILE`: ``` configure.ac:335: warning: The macro `AC_TRY_COMPILE' is obsolete. configure.ac:335: warning: The macro `AC_TRY_LINK' is obsolete. ``` - `libtool`-related ones: ``` configure.ac:70: warning: The macro `AC_LIBTOOL_WIN32_DLL' is obsolete. configure.ac:70: warning: AC_LIBTOOL_WIN32_DLL: Remove this warning and the call to _LT_SET_OPTION when you configure.ac:70: put the 'win32-dll' option into LT_INIT's first parameter. configure.ac:71: warning: The macro `AC_PROG_LIBTOOL' is obsolete. ``` Using code copied from curl:9ce7eee070/m4/xc-lt-iface.m4 (L157-L163)- delete commented and obsolete `AC_HEADER_STDC`. - formatting. Most cherry-picked from `autoupdate` updates. Cherry-picked from #1017 Closes #1021