Update .gitignore

Change-Id: If85522504242dff45a681c3fece3b3c8a03de61f
Reviewed-by: Lorn Potter <lorn.potter@jollamobile.com>
Reviewed-by: Aaron McCarthy <aaron.mccarthy@jollamobile.com>
test: Mark tst_declarative_ui as insignificant on Windows as well

It was actually also failing on Windows. Adding win32 back in the
.pro file.

Task-number: QTBUG-31797

Change-Id: I79e7d620c37e99c6f2b3644f66daf774ee7c31a9
Reviewed-by: Alex <alexander.blasche@digia.com>