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Add python 3.8.0rc1 to windows possibilities

MRG: fixes to allow Python 3.8 RC installs

Remove `m` from ABI tag.

Look for RC when installing Python 3.8 from macOS download.

MRG: more explicit support for manylinux > 1

Add MB_ML_VER variable to choose Manylinux version.

Closes gh-238.

Updated Python versions

MRG: Rename 'gh-clone' to fix bash error on MacOS

Fixes https://github.com/matthew-brett/multibuild/issues/259.

Updated openssl to 1.0.2t

Co-Authored-By: Andrew Murray <3112309+radarhere@users.noreply.github.com>

It isn't present on macOS.

swig build failing because built configure script not on path.

Balance backticks

Remove "remove OCLint" workaround

Since https://github.com/travis-ci/travis-build/commit/52c6b6cc1d537e52c8ae6f0906944d6fcaa3d173, it's no longer needed

and may trigger stuff like [unnecessary `git clone`s](https://travis-ci.org/skvark/opencv-python/jobs/569294041#L2310).

Since https://github.com/travis-ci/travis-build/commit/52c6b6cc1d537e52c8ae6f0906944d6fcaa3d173, it's no longer needed

Allow PLAT to be unset

Set defaults for PLAT where needed

Use $PLAT default in tests

Fix what appears to be a variable typo for PLAT

See:
https://github.com/matthew-brett/multibuild/pull/242#issuecomment-513244208

* pr/221:
  Step up distros to Xenial + Trusty

Removed Xcode 6.4 builds from Travis CI

> Running builds with Xcode 6.4 in Travis CI is deprecated and will be removed in January 2019. If Xcode 6.4 is critical to your builds, please contact our support team at support@travis-ci.com to discuss options.

Pass MB_PYTHON_VERSION to docker run in build_multilinux