Pin the qtbase SHA1
Pin the qtbase SHA1

In preparation of staging
https://codereview.qt-project.org/#change,27471 in qtbase, which
isn't source/behaviorally compatible with qtdeclarative.

https://codereview.qt-project.org/#change,27477 adapts qtdeclarative
to the qtbase change, and will be staged (together with the change
that unpins the SHA1) once the qtbase change has gone in.

Change-Id: Ia47f1d86855a388a5ecf9520ed21dd52c43b1b95
Reviewed-by: Aaron Kennedy <087c9f3fe24ea980d31d6a327c000f1b04b5a585@nokia.com>

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