add fixautoconf

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5109 d0543943-73ff-0310-b7d9-9358b9ac24b2

build/fixautoconf.sh

+cd /tmp
+mkdir fix_autoconf
+cd fix_autoconf
+wget http://mirrors.kernel.org/gnu/autoconf/autoconf-2.61.tar.gz
+tar -zxvf autoconf-2.61.tar.gz
+cd autoconf-2.61
+./configure --prefix=/usr
+make
+make install
+cd /tmp
+rm -fr fix_autoconf
+