fix warning C4251: 'poppler::text_box::m_data': class...

fix warning C4251: 'poppler::text_box::m_data': class 'std::unique_ptr<poppler::text_box_data,std::default_delete<poppler::text_box_data>>' needs to have dll-interface to be used by clients of class 'poppler::text_box'
7 jobs for test-fix-export-stl in 5 minutes and 10 seconds (queued for 1 second)
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Status Name Job ID Coverage
  Build
passed build #6537194

00:04:50

passed build_android #6537199

00:00:47

passed build_clang_libcpp #6537195

00:05:10

passed build_clazy #6537198

00:04:16

passed build_mingw64_fedora #6537197

00:03:02

passed build_ubuntu_16_04 #6537196

00:02:09

passed clang_format #6537193

00:01:08