[bug#28016] [PATCH] Reproducible issue for libjpeg-turbo

[Z. Ren]

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

After investigation, we observe that the unreproducibility is caused by the 
"configure" script, in which the output of `date` is captured. 

The attached patch substitutes the `date` according to the SOUR_DATE_EPOCH.  
Once applied, libjpeg-turbo could be built deterministically.

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

0001-reproducible-fix-for-libjpeg-turbo.patch
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