revert to readline 6.2 on AIX only

Author: Arnon Yaari

buildout-build-aix.cfg

@@ -64,6 +64,9 @@ patches = ${:patches-dir}/${:name}-${:version}-sysconfig.py.patch
     ${:patches-dir}/${:name}-${:version}-aix-fopen.patch
 post-make-hook = ${options:hooks-dir}/aix.py:python_post_make
 
+[readline]
+version = 6.2
+
 [python-environment]
 <= environment
 CFLAGS = ${environment:CFLAGS} -I${options:prefix}/include/gnutls -I${options:prefix}/include/graphviz -I${options:prefix}/include/libexslt -I${options:prefix}/include/libxml2 -I${options:prefix}/include/libxslt -I${options:prefix}/include/ncurses -I${options:prefix}/include/openssl -I${options:prefix}/include/readline -I${options:prefix}/include/sasl -I${options:prefix}/lib/libffi-${libffi:version}/include