[PyQt] Support for relocated Qt installations.

[Giulio Eulisse]

Dear all,

the project I work for packages all of its software so that the build
and installation path can be different. In order to make qt programs
relocatable we use our own qt.conf that gets relocated at
post-installation time with the correct installation path.

This seems to confuse pyqt building, because the "qtdirs" program,
used at build time by pyqt, does not use qt.conf, because no
QCoreApplication is created.

The attached patch fixes the problem. Do you think you could accept it
upstream, so that we don't have to maintain the patch ourself?

--
Ciao,
Giulio
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