[Development] important: upcoming rename of _qpa.h to _p.h

[Rohan McGovern]

Girish Ramakrishnan said:
> Hi,
> 
> On Tue, May 8, 2012 at 3:07 AM, Girish Ramakrishnan
> <girish at forwardbias.in> wrote:
> > The change landed. For some reason, the ci is failing compile in all
> > other modules. Works locally with shadow builds but not on CI. I am on
> > it.
> >
> 
> Fix is integrating: https://codereview.qt-project.org/#change,25570.
> Sorry for blocking the CI.
> 

Ideally this would have been caught by the reverse dependency qtdeclarative
test in qtbase's CI, but apparently the issue only affected shadow builds,
which weren't covered.

We'll add a shadow build revdep-qtdeclarative config to prevent similar
issues in the future.