Bug#1035324: shaderc: reproducible-builds: Differences when /bin/sh -> bash

[Vagrant Cascadian]

Source: shaderc
Severity: normal
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: shell
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

When /bin/sh points to bash (instead of dash), the behavior of "echo"
differs in the rendering of "\n":

  https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/diffoscope-results/shaderc.html

  /usr/bin/glslc

  shaderc·2023.2-1\nspirv-tools·2023.1-2
  vs.
  shaderc·2023.2-1	 
  spirv-tools·2023.1-2

The attached patch to debian/rules fixes this by switching to use
printf, which appears to behave consistently regardless of the shell (at
least with my quick testing).

Thanks for maintaining shaderc!

live well,
  vagrant
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