Update PKGBUILD

[sevu]

updating to the AUR version.

@eamanu you have a packaging related PR, would you have any changes to propose here once #2047 is merged? Most python packages don't specify the directory for site-packages in the PKGBUILD.

[centaurialpha]

Sorry, I'm a little lost, it must be because I do not understand very well how AUR works or things like that. Could you explain a little more what you want to say?

[sevu]

Python stuff can mostly be installed with such a command, and depend, for the installation only, on python-setuptools.
python3 setup.py install --root="/" --optimize=1

I don't know how to set that up and instead copied the files with cp
The PR looks like it has sth. to do with the usual way to install python things.

[sevu]

Feel free to merge, it's not dependent on the other one, this was just room for further improvement.

As for the pkgver() function, packages with the -git suffix build usually a new version than mentioned in the pkgbuild, and this one takes the last commit date as version.

[centaurialpha]

Thanks! @sevu