Bug#841777: perl-tk: please make the build reproducible

[Reiner Herrmann]

Source: perl-tk
Version: 1:804.033-1
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: buildpath
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

Hi!

While working on the "reproducible builds" effort [1], we have noticed
that perl-tk could not be built reproducibly.
It does not use dpkg-buildflags while compiling C sources, which causes
the build path to be embedded in debug symbols, as -fdebug-prefix-map is
not specified.

The attached patch fixes this by passing the CFLAGS to the build process.

Regards,
 Reiner

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