[PyQt] Cannot install PyQt 5 on Ubuntu 14.04 (Python 3.4)

[Ghislain Vaillant]

Although there are wheels available for Python 3.4 now, it is still not
possible to install PyQt 5 in a venv created on Ubuntu 14.04.

I get the following error:

```
pip install pyqt5
Collecting pyqt5
  Using cached PyQt5-5.7.1-5.7.1-cp34.cp35.cp36-abi3-manylinux1_x86_64.whl
Collecting sip>=4.19 (from pyqt5)
  Could not find a version that satisfies the requirement sip>=4.19 (from
pyqt5) (from versions: )
No matching distribution found for sip>=4.19 (from pyqt5)
```

Checking on PyPI, there are only wheels for sip==4.19 for Python 3.5+ and
no tarball at all, hence the failure.

Cheers,
Ghis
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