Add skipped tests to the result set

Summary: Closes https://github.com/facebook/hhvm/pull/3333

Reviewed By: @LiraNuna

Differential Revision: D1470614

Pulled By: svcscm
use cmake variable to set linker flags

Summary: Putting static linking in C(XX) flags is total overkill, and CMake
provides a nice variable for these kinds of linker flags.

Closes https://github.com/facebook/hhvm/pull/3311

Reviewed By: @sgolemon

Differential Revision: D1467630

Pulled By: svcscm
Update Travis CI config so it runs ext_redis tests

Summary: * Declare a redis service, per
  <http://docs.travis-ci.com/user/database-setup/#Redis>
* Set the env var REDIS_TEST_HOST so hphp/test/slow/ext_redis/config.skipif
  doesn't skip the tests.

Closes https://github.com/facebook/hhvm/pull/3317

Reviewed By: @sgolemon

Differential Revision: D1467670

Pulled By: svcscm