Compiler Warnings using Oracle Developer Studio on Solaris

Fixes for issue #75.

ax_nagios_get_ssl

@@ -59,6 +59,7 @@ SSL_HDR=
 SSL_LIB_DIR=
 
 AC_SUBST(HAVE_SSL)
+AC_SUBST(SSL_TYPE)
 AC_SUBST(SSL_INC_DIR)
 AC_SUBST(SSL_HDR)
 AC_SUBST(SSL_INC_PREFIX)