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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passed #6537194
build

00:04:50

passed #6537199
build_android

00:00:47

passed #6537195
build_clang_libcpp

00:05:10

passed #6537198
build_clazy

00:04:16

passed #6537197
build_mingw64_fedora

00:03:02

passed #6537196
build_ubuntu_16_04

00:02:09

passed #6537193
clang_format

00:01:08