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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

Add notes about MB_PYTHON_OSX_VER

* pr/240:
  Removed Python 3.4

Remove redundant clauses from README.rst

Time to retire expansive wheel naming on macOS

MRG: Remove temporary directory if empty

Clean up the temporary directory 'tmp_for_test' at the end of `install_run` if no files are left inside.

It is useful sometimes (e.g. in config.sh's pre_build') to do stuff based on
the current python version. The problem is that when running inside the docker
container the variable MB_PYTHON_VERSION is passed on only as PYTHON_VERSION
without the MB_ prefix, but in the macOS environment the latter is not
present. Thus, one needs to check both PYTHON_VERSION and MB_PYTHON_VERSION.
Better to pass both to the docker container, so one can jut check the value
of MB_PYTHON_VERSION on both mac and linux.

Note that the same hack is used in the 'install_run' function, where both
PYTHON_VERSION and MB_PYTHON_VERSION are passed through to docker run.

Updated PyPy to 7.1.1

Updated openssl to 1.0.2s

Adding platforms to wheels needed for pip < 6.0, but is now more than 4
years ago. Pip 6.0 released in December 2014:
https://pypi.org/project/pip/#history

Updated libpng to 1.6.37

# Conflicts:
#	README.rst

Updated Python versions