[Development] abi breakage for qtwebengine libraries in 5.9

[Allan Sandfeld Jensen]

On Monday 08 May 2017, Lars Knoll wrote:
> Hi,
> 
> why can't we just keep these symbols around without exporting them through
> a header file and make them simply forward to the global new/delete
> operators? If we don't export them in a header at least newly compiled
> code would stop using them, and old code would continue working like that.
> 
They were never exported through a header file. They were just marked exported 
and then picked up by the linker when it looked for new/delete definitions.

`Allan