Log Message:
zathura-pdf-mupdf: Update print/zathura-pdf-mupdf to 0.3.4

pkgsrc changes:
- Adjust to meson build system
- Pass `-D link-external=true' to meson in order to link to mupdf third
  parties libraries

Changes:
0.3.4
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- Compatible with mupdf 1.14
- Various fixes and improvements

0.3.3
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- Replace build system with meson
- Various fixes and improvements