buildenv/1.3.x/centos-ermine: add intltool to fix build on some distros (such as Ubuntu 17.10).

[mkrautz]

No description provided.

[Kissaki]

So this is a new tool we didn't use before?
What is it used for?

Maybe a short description of what it is and what it is used for would be useful? In the commit message, maybe in the build script head?

Project page says its about translation strings, but I can't quite make out what it does for us from the build script?

Did we use it as part of sth else but have to patch it so we now pull it as an explicit dependency to do so?

[mkrautz]

The problem is that the intltool package in Ubuntu 17.10 doesn't have the patch (that we apply in here) applied to it.

Where we normally use the buildenv, on our old CentOS builder, it isn't a problem.

So this is merely a fix for being able to run the build on newer machines.

I'll update things to be more descriptive.