Bug#542726: enable hardening options

[Kees Cook]

Package: exim4
Version: 4.69-11
Severity: normal
Tags: patch
User: ubuntu-devel at lists.ubuntu.com
Usertags: origin-ubuntu karmic ubuntu-patch

Hello!

Since exim4 handles untrusted inputs and listens on a network port, I
think it might benefit from having hardening[1] enabled for its build.
The attached patch implements this.

Thanks!

-Kees

[1] http://wiki.debian.org/Hardening

-- 
Kees Cook                                            @debian.org
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