[issue8510] update to autoconf2.65

[Matthias Klose]

Matthias Klose <doko at debian.org> added the comment:

here is the diff for configure.in. The __EXTENSIONS__ macro is defined by 2.65 for Solaris, removed this explicit definition. running a test build

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Added file: http://bugs.python.org/file17070/configure.in.diff

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