remove the python limition of qt5-webkit (if possible)

[Walter Schwarzenfeld]

If try to install qt5-webkit from a dependend port I got:

qt5-webkit-5.212.0.a2_5 needs Python 2.7 at most, but 3.6 was specified

if possible, could someone remove the limitation of
python:2.7,build

change to
python:build