winrtrunner: CoreCon builds with x64, so let it

The phone portions may not initialize on x64, but we can still let them
build.

Change-Id: I60f886a0662772547778a7130422104283fd39a1
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
WinRTRunner: Fixed access violation when listing phone devices

In case of an x64 environment phone devices cannot be listed, but
winrtrunner should not crash in this case.

Change-Id: I6963e1c4f2dc73424fa7ebde13cbce759dfaabc4
Reviewed-by: Andrew Knight <andrew.knight@digia.com>