fix: determine the path of `viewjpeg.ps` in /usr/share.

pdfcompress

@@ -63,11 +63,11 @@ pdftoppm -r 300 -jpeg -jpegopt "quality=$quality,optimize=y" -progress $input_fi
 
 for f in "$temp_pages_dir"/page-*.jpg; do
     logf "Wrapping $f into ${f/.jpg/.pdf}\n"
-    gs -dNOSAFER  -sDEVICE=pdfwrite -o "${f/.jpg/.pdf}" /usr/share/ghostscript/lib/viewjpeg.ps -c "($f)" viewJPEG
+    gs -dNOSAFER  -sDEVICE=pdfwrite -o "${f/.jpg/.pdf}" $(find -iname viewjpeg.ps /usr/share | head -1) -c "($f)" viewJPEG
 done
 
 logf "Merging compressed pages to a single PDF\n"
 pdfunite "$temp_pages_dir"/page-*.pdf $output_file
 
 rm -r "$temp_pages_dir"
-logf "Done\n"
+logf "Done\n"