[PyQt] fix build against Qt 5.11.0

[Rex Dieter]

My previous foray into building snapshots partly about getting something 
working against Qt 5.11.0.  Turns out only one small fix was required, due 
to
http://code.qt.io/cgit/qt/qtbase.git/commit/src/testlib/qtestmouse.h?id=75e583b3fcbdbbb999633eb5f2267720dd695cfa
removing waitForEvents


-- Rex
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