Bug#1020665: libimage-imlib2-perl: reproducible-builds: Embedded build path in Imlib2.so

[Vagrant Cascadian]

Source: libimage-imlib2-perl
Severity: normal
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: buildpath
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

The build path is embedded in
/usr/lib/x86_64-linux-gnu/perl5/5.34/auto/Image/Imlib2/Imlib2.so:

  https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/diffoscope-results/libimage-imlib2-perl.html

  /build/1st/libimage-imlib2-perl-2.03/lib/Image/Imlib2.c:2662
  vs.
  /build/2/libimage-imlib2-perl-2.03/2nd/lib/Image/Imlib2.c:2662

The attached patch fixes this by adjusting Build.PL to add
-ffile-prefix-map to $cflags.

With this patch applied libimage-imlib2-perl should build reproducibly on
tests.reproducible-builds.org!

Thanks for maintaining libimage-imlib2-perl!

live well,
  vagrant
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