Remove python-pip from makedeps

[micwoj92]

aur/python-skia/PKGBUILD

Line 13 in 193c9f4

makedepends=(python-pip)

aur/python-pantable-git/PKGBUILD

Line 17 in 193c9f4

'python-pip')

aur/python-ttfautohint-py/PKGBUILD

Line 12 in 193c9f4

makedepends=(python-pip)

This all should be using python-installer which is much simpler and brings less (indirect) dependencies.
Related: #98

[alerque]

Yes. I think all of these pre-date python-installer even existing, but updating to current Python workflows is always welcome.

[micwoj92]

Would you prefer 1 pr or separate per package?

[alerque]

One commit per package is a bit easier to deal with because if something goes wrong with a multi-package commit in the later subtree pushes to the AUR, backtracking is harder if they are not in separate commits. Whether those are in one or many PRs doesn't matter much to me.

[micwoj92]

Done, unfortunately with this change there is python-skia bump to prelease.
Alternativery the wheel itself could be built from source.