PyQt 4.11 compatibility

[pallegro]

Starting in PyQt 4.11, there is no pyqtconfig, so this patch imitates it when its not found.
pyqtconfig.QtGuiModuleMakefile simply calls sipconfig.SIPModuleMakefile with qt=['QtCore', 'QtGui'],
thus this patches has no effect if pyqtconfig is found (i.e. if the user has PyQt <=4.10)

[bchretien]

This fails on Arch. /usr/share/sip contains several directories:

• Py2-PyQt4
• Py2-PyQt5
• PyQt4
• PyQt5
• Qwt5

I had to set "pyqt_sip_dir" to "/usr/share/sip/Py2-PyQt4" to fix the compilation of rviz.

cc @v01d

[bchretien]

Note: this PR aims at solving #13.

[pallegro]

/usr/share/sip/PyQt4 is what's used by Ubuntu Utopic, so I've updated the path to that.

[bchretien]

If I'm not mistaken, /usr/share/sip/PyQt4 is the default path for PyQt4, so the one that packagers keep for the PyQt4 version associated with their distribution's default Python version (Python 3 for Arch, Python 2 for Ubuntu). Arch's PKGBUILD for PyQt4 seems to confirm it.

I guess that if this is the only part really specific for Arch, I can just keep a good ol' sed replace in the PKGBUILD, unless there's a way to get these values from somewhere else.

[bchretien]

But as you said on the AUR, if sip files in /usr/share/*PyQt4 are identical, this could be solved in Arch's PyQt4 package.

[dirk-thomas]

Superseded by #21.