Build error with poppler-0.86.0

[Andreas Sturmlechner]

New poppler version was released yesterday, here's the related change
that is likely to blame:

https://gitlab.freedesktop.org/poppler/poppler/-/commit/5804f51c7cf439432082b668ba8df3b0a6048caf

This is where LO (6.3.5.2) build goes wrong, LO master code looks the same:

sdext/source/pdfimport/xpdfwrapper/pdfioutdev_gpl.cxx:567:64:
error: base operand of ‘->’ has non-pointer type ‘const string’
       {aka ‘const std::__cxx11::basic_string<char>’}
 567 | const char* pURI = static_cast<LinkURI*>(pAction)->getURI()->c_str();
     |                                                            ^~

Downstream report with full build.log attached:
https://bugs.gentoo.org/711102


Best regards,
Andreas
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