travis: (maybe) fix MaraiDB 5.5 build

tools/travis/before_script.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# Copyright(C) 2012-2015 Kouhei Sutou <kou@clear-code.com>
+# Copyright(C) 2012-2016 Kouhei Sutou <kou@clear-code.com>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -57,6 +57,11 @@ else
     mysql-5.7.*)
       (cd vendor/mysql && sudo debian/rules override_dh_auto_configure)
       ;;
+    mariadb-5.5.*)
+      (cd vendor/mysql && sudo debian/rules configure)
+      configure_args=("${configure_args[@]}"
+                      "--with-mysql-build=$PWD/vendor/mysql/builddir")
+      ;;
     *)
       :
       ;;