use 2.59

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@17060 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/silk/configure.in

 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
-AC_PREREQ([2.63])
+AC_PREREQ([2.59])
 AC_INIT(libSKP_SILK_SDK, 1.0.2, brian@freeswitch.org, libSKP_SILK_SDK)
 AM_INIT_AUTOMAKE(libSKP_SILK_SDK,1.0.2)