* gnu/packages/pdf.scm (mupdf)[source]: Add patch.
[arguments]: Build and find the shared library.
(zathura-pdf-mupdf)[arguments]: Add a 'remove-libmupdfthird.a-requirement
phase to deal with the now-missing static one.
* gnu/packages/patches/mupdf-fix-linkage.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
