libre: netpbm: update to 10.73.36 by syncing with Arch Linux

According to Wikipedia: "GIF images are compressed using the
Lempel–Ziv–Welch (LZW) lossless data compression technique to reduce
the file size without degrading the visual quality. This compression
technique was patented in 1985. Controversy over the licensing
agreement between the software patent holder, Unisys, and CompuServe
in 1994 spurred the development of the Portable Network Graphics (PNG)
standard. By 2004 all the relevant patents had expired."[1].

So we can safely stop removing GIF related code on the basis of
patents alone.

[1]https://en.wikipedia.org/wiki/GIF

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

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