MuPDF (experimental): delete metadata

Looks like Artifex decided to halt this project.

metadata/com.artifex.mupdf.example.txt

@@ -1,49 +0,0 @@
-Categories:Reading
-License:AGPL-3.0+
-Web Site:http://mupdf.com
-Source Code:http://git.ghostscript.com/?p=mupdf.git;a=summary
-Issue Tracker:http://bugs.ghostscript.com
-Changelog:http://git.ghostscript.com/?p=mupdf.git;a=blob_plain;f=CHANGES;hb=HEAD
-
-Name:MuPDF (experimental)
-Auto Name:MuPDF
-Summary:Lightweight document viewer
-Description:
-MuPDF supports PDF 1.7 with transparency, encryption, hyperlinks, annotations,
-searching, form editing and more. It also reads OpenXPS and CBZ (comic book)
-documents.
-.
-
-Repo Type:git
-Repo:http://git.ghostscript.com/mupdf-android-viewer-nui.git
-
-Build:1.11-nui,111
-    disable=wait for release
-    commit=61f069e53bc9a3f598f6ea9ed766ad5fdd149186
-    subdir=app
-    submodules=yes
-    gradle=yes
-    forceversion=yes
-    forcevercode=yes
-    prebuild=pushd ../libmupdf && \
-        make generate && \
-        popd
-    ndk=r11c
-
-Maintainer Notes:
-The basename "bears no resemblance to the app version", however 1.4
-used 40 and 1.5 used 50. This would make 1.6 start with 60 -- or
-even a 16xx scheme.
-
-Documents:
-http://www.mupdf.com/docs/how-to-build-mupdf-for-android
-http://mupdf.com/downloads/
-http://twiki.ghostscript.com/do/view/MuPDF/AndroidReleases
-http://git.ghostscript.com/?p=mupdf.git;a=blob;f=platform/android/jni/Application.mk;h=60909b6e9989b79231a6f3a7a04f371039185dbf;hb=HEAD
-.
-
-Archive Policy:0 versions
-Auto Update Mode:None
-Update Check Mode:None
-Current Version:1.11
-Current Version Code:111