[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] .travis_install.sh update (#261)

[akgrant43]

> why merge and roll back later? I mean, why is this just a temporary fix? What are the disadvantages/advantages if we keep the commit?

The advantage is that the script will survive Travis not updating the environment for us.

The disadvantages are:

- It's a bit slower (there's obviously more being done).
- It increases slightly the chances that a temporary network problem will causes the build to fail.

Of course, there may be others that I haven't thought of.

I should also add that it isn't 100% clear to me that Travis will ever "fix" the issue.  They may decide that if you want to install software you should do an update - they mention trying to automatically determine whether an install is done, and maybe our script isn't detected.

Cheers,
Alistair

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