[bug#28015] [PATCH] Reproducible issue for djvulibre

[Z. Ren]

Hi!
While conducting a study inspired by the "reproducible builds" practice [1], we 
have noticed that the package djvulibre could not be built reproducibly.

After investigation, we observe that the unreproducibility is caused by 
"desktopfiles/Makefile.in", in which the command gzip is invoked without the 
"-n" argument. Consequently, timestamp is captured in the built file 
"share/icons/hicolor/scalable/mimetypes/djvu.svgz".

The attached patch adds the argument to the gzip command. Once applied, 
djvulibre could be built reproducibly.

 [1]: https://wiki.debian.org/ReproducibleBuilds

0001-reproducible-fix-for-djvulibre.patch
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