Update makefile for use with pypy and 64 bit linux.

[jeremylow]

Description

Changes the makefile to get the uname -m (returning either "i686" for 32-bit systems or "x86_64" for 64-bit systems) and uname -s (returning "Linux" at least on Ubuntu and Arch) and, if it's "x86_64" & "Linux", then use the source distribution of pypy-5.3.

Related Issue

#378

Motivation and Context

Running make dev on a 64-bit Linux system results in failure to install pypy-5.3, since only pypy-5.3-src is available for 64-linux.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the code style of this project.
• All new and existing tests passed.

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This change is

[jeremylow]

Build is failing on make dev trying to build pypy-5.3-src from source, which would slow down builds considerably.

pyenv install -s 2.7.11
pyenv install -s 3.5.2
Downloading Python-3.5.2.tar.xz...
-> https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tar.xz
Installing Python-3.5.2...
Installed Python-3.5.2 to /opt/circleci/.pyenv/versions/3.5.2

pyenv install -s pypy-5.3-src
pyenv-install: pypy-5.3-src: PyPy requires `curses' in 2.7.11 to build from source.
make: *** [dev] Error 1

make dev returned exit code 2

Action failed: make dev

[bear]

we could adopt a policy of supporting versions of pypy that have binary distributions and bump the version to 5.2?

[jeremylow]

Another option is to have the make ci target be explicit about the versions to use and have the make dev target take into account the user's machine. Right now, it looks like the pyenv versions available on the CI machines are 3.5.1 and 2.7.11. When we changed that from 3.5.1 to 3.5.2, we started downloading and installing a new version of 3.5.2 each time we ran a build. I'd be OK with either mirroring what's available on CircleCI or sticking to binary versions.

[bear]

My goal for doing that was to have CI be against the most recent versions, but i'm for your plan

[bear]

Reviewed 1 of 1 files at r1, 1 of 1 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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Comments from Reviewable

[jeremylow]

Finally! That's a niffy ssh feature, @bear. So at the moment our CI is a little behind relative to cutting edge versions of python/pypy, but we've got tests running across all major versions, so I think that works for me.

[bear]

Reviewed 1 of 1 files at r3.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[bear]

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Reviewed 1 of 1 files at r3.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable