Fix QPainter::drawGlyphs() with non-affine transformation

Fix QPainter::drawGlyphs() with non-affine transformation

When the matrix has an non-affine transformation, the text will have to
be rendered using the default path-renderer. This means going through
the drawTextItem() path (since drawStaticText() has no support for those
transformations) and it also means not pre-transforming the coordinates,
since the default implementation of drawTextItem() supports
transformations.

Task-number: QTBUG-18214
Reviewed-by: Jiang Jiang
(cherry picked from commit 55446d104db77fc7994ab12352b1c08bb7b63346)