.travis.yml: install missing library
.travis.yml (before_install): install gdbm too.
.travis.yml (script): test options should be in TESTOPTS.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49815 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
.travis.yml: install missing library
.travis.yml (before_install): install gdbm too.
.travis.yml (script): test options should be in TESTOPTS.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49815 b2dd03c8-39d4-4d8f-98ff-823fe69b080e