sd: disable pdf import tests

[Stephan Bergmann]

On 17/12/2019 01:46, Ashod Nakashian wrote:
> On 12/16/19 11:59 AM, Stephan Bergmann wrote:
>> What's the reason for this change, and/or are there plans to enable 
>> the tests again?  (`git log -SIMPORT_PDF_ELEMENTS` shows this to be 
>> the only commit ever mentioning that identifier, so the tests are 
>> indeed disabled since then.) 
> 
> The tests are conditional on IMPORT_PDF_ELEMENTS because with the PDFium 
> import logic, PDFs are imported as images, not individual elements 
> (users can break the image into editable elements from the UI).
> 
> Since these tests rely on importing PDF elements individually, the 
> PDFium importing logic breaks them.

But where does the the IMPORT_PDF_ELEMENTS macro get defined, if anywhere?