Fix qsqvgfunctions_wince_p.h include in order make build pass for WEC7.

Apparently the included header name was not renamed when the following
patch: https://codereview.qt-project.org/23497

 evolved and header
filename was changed.

Change-Id: Id4ff055046c46b630c2014bc1ba60f36c8520337
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>