py-pyqt4: fix for the depends_lib reset caused by the Python PortGroup

[Joshua Root]

Doesn't even parse here:

Failed to parse file python/py-pyqt5/Portfile: can't read 
"python.version": no such variable

On 2016-12-20 12:35 , Marko Käning wrote:
> Turns out there is a double dep on qt5-qtbase now:
> ---
> $ port deps py\*-pyqt5
> Full Name: py-pyqt5 @5.6_3
> Build Dependencies:   pkgconfig
> Library Dependencies: py27-pyqt5, qt5-qtbase
> --
> Full Name: py27-pyqt5 @5.6_3
> Build Dependencies:   pkgconfig
> Library Dependencies: qt5-qtbase, python27, qt5-qtbase, py27-sip, dbus-python27
> --
> Full Name: py34-pyqt5 @5.6_3
> Build Dependencies:   pkgconfig
> Library Dependencies: qt5-qtbase, python34, qt5-qtbase, py34-sip, dbus-python34
> --
> Full Name: py35-pyqt5 @5.6_3
> Build Dependencies:   pkgconfig
> Library Dependencies: qt5-qtbase, python35, qt5-qtbase, py35-sip, dbus-python35
> ---
>
> I closed https://trac.macports.org/ticket/53090 obviously too quickly. :(
>