Build with automake-1.13 broken (fix included)

[Marko Lindqvist]

Automake-1.13 removed long obsolete AM_CONFIG_HEADER completely (
http://lists.gnu.org/archive/html/automake/2012-12/msg00038.html ) and errors
out upon seeing it.

Attached patch replaces it with proper AC_CONFIG_HEADERS.


 - ML
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