Blocked revisions 80964-80966,80969-80970 via svnmerge

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  r80964 | matthias.klose | 2010-05-08 12:00:28 +0200 (Sa, 08 Mai 2010) | 2 lines

  - Issue #8510: Update to autoconf2.65.
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  r80965 | matthias.klose | 2010-05-08 12:14:46 +0200 (Sa, 08 Mai 2010) | 2 lines

  - configure.in: Replace AC_HELP_STRING with AS_HELP_STRING
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  r80966 | matthias.klose | 2010-05-08 12:17:27 +0200 (Sa, 08 Mai 2010) | 2 lines

  configure.in: s/AC_AIX/AC_USE_SYSTEM_EXTENSIONS/
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  r80969 | matthias.klose | 2010-05-08 13:01:39 +0200 (Sa, 08 Mai 2010) | 3 lines

  configure.in: convert all obsolete AC_TRY_* macros to AC_*_IFELSE,
  only whitespace changes in generated configure (diff -uEwB).
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  r80970 | matthias.klose | 2010-05-08 13:04:18 +0200 (Sa, 08 Mai 2010) | 4 lines

  configure.in: Avoid autoconf warning: Assume C89 semantics that
  RETSIGTYPE is always void (issue #8510).
  pyconfig.h: Regenerate
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