Value is assigned to $with_ssl_dir but used from $with_ssl which is wrong.
Fix configure since it's a one-liner and avoid an autoreconf.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff -Nura tn5250-0.17.4.orig/configure tn5250-0.17.4/configure
--- tn5250-0.17.4.orig/configure	2014-09-10 08:33:15.689519554 -0300
+++ tn5250-0.17.4/configure	2014-09-10 08:33:47.428613117 -0300
@@ -23258,7 +23258,7 @@
 if test "${with_ssl_dir+set}" = set; then
   withval=$with_ssl_dir;
     if test "$with_ssl_dir" != "no"; then
-         checksslinclude "$with_ssl"
+         checksslinclude "$with_ssl_dir"
     else
         for topdir in /usr/local /usr /usr/pkg /usr/lib /var/ssl /opt; do
             for subdir in $topdir $topdir/openssl $topdir/ssl; do
