python-3.6.4: Install Meson

Description [1]:

> Meson is an open source build system meant to be both extremely fast,
> and, even more importantly, as user friendly as possible.
>
> The main design point of Meson is that every moment a developer spends
> writing or debugging build definitions is a second wasted. So is every
> second spent waiting for the build system to actually start compiling
> code.

Unfortunately, MarIuX only ships Python 3.3, and it’s a pain to set up
Setuptools. Meson also requires the module *pathlib*, which is included
in the Python distribution since version 3.4.

So install Meson here, and adapt bee to use the package environment.

[1] [1] http://mesonbuild.com/index.html

python-3.6.4-0.build.sh

@@ -35,3 +35,4 @@ pip3 install scikit-learn
 pip3 install seaborn
 pip3 install metaseq
 pip3 install Mako
+pip3 install meson