Fix wrong path to endian/test in status/Jamfile.v2

You can get following error message.

    [vagrant@master ~/boost/status]$ b2
    /usr/home/vagrant/boost/tools/build/src/build/project.jam:262: in find-jamfile from module project
    error: Unable to load Jamfile.
    error: Could not find a Jamfile in directory '../libs/endian'.
    error: Attempted to find it with pattern '[Bb]uild.jam [Jj]amfile.v2 [Jj]amfile [Jj]amfile.jam'.
    error: Please consult the documentation at 'http://www.boost.org'.
    /usr/home/vagrant/boost/tools/build/src/build/project.jam:280: in load-jamfile from module project
    /usr/home/vagrant/boost/tools/build/src/build/project.jam:64: in load from module project
    /usr/home/vagrant/boost/tools/build/src/build/project.jam:89: in load-used-projects from module project
    /usr/home/vagrant/boost/tools/build/src/build/project.jam:75: in load from module project
    /usr/home/vagrant/boost/tools/build/src/build/project.jam:145: in project.find from module project
    /usr/home/vagrant/boost/tools/build/src/build-system.jam:535: in load from module build-system
    /usr/home/vagrant/boost/tools/build/src/kernel/modules.jam:289: in import from module modules
    /usr/home/vagrant/boost/tools/build/src/kernel/bootstrap.jam:139: in boost-build from module
    /usr/home/vagrant/boost/boost-build.jam:17: in module scope from module