[PyQt] Bug building with Qt features disabled

[Jeremy Sanders]

Hi -

Using Qt 5.9.1, Python 3.5.4, sip 4.19.3 and PyQt5 5.9, I get errors 
when trying to build PyQt5 with Qt features disabled (here opengl). It 
doesn't correctly seem to detect the disabled features, as the features 
are split into individual characters.

This attached patch seems to fix the problems for me.

Thanks

Jeremy
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