configure.ac: Updated configure.ac to require autoconf 2.60

[Benjamin Arai]

Hi,

Running autoconf 2.59 generates a "configure" script but the generated
"configure" script fails on a parse error.  I verified that using
autoconf version 2.60 generates a good "configure" script.

---
 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

-- 
Benjamin Arai
http://www.benjaminarai.com
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