Bug#975025: flex: reproducible builds: example Makefiles contain build paths

[Vagrant Cascadian]

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

Well, this is a bit of a re-run: Bug#949343: flex: Embeds build paths in
example Makefiles

But in my proposed fix for that version, I neglected to test only
building arch:all packages, which triggered: #961778 flex: binary-all
FTBFS

This time, I'm proposing a much simpler fix; just remove the generated
Makefiles, but only remove them when ... they are actually present!
(e.g. arch:any build vs. arch:all build)

I think this is a better approach than sanitizing the Makefile, since
the Makefile.am is also shipped, and a person who wanted to build the
examples would probably need to regenerate the Makefile anyways.

Patch attached, tested with arch:all only, arch:any only and
arch:all+any builds.


live well,
  vagrant
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