* gnu/packages/pdf.scm (mupdf): Update to 1.9a. [source]: Use "mupdf-build-with-openjpeg-2.1.patch". Adjust snippet to preserve bundled 'thirdparty/mujs'. [inputs]: Add harfbuzz. Replace openjpeg-2.0 with openjpeg. * gnu/packages/patches/mupdf-build-with-openjpeg-2.1.patch: New file. * gnu/local.mk (dist_patch_DATA): Add it.