Bug#733879: please remove useless build-dep on mail-transport-agent

[Ivo De Decker]

package: libemail-send-perl
version: 2.198-4

Hi,

libemail-send-perl has a build-depends on "nullmailer | mail-transport-agent",
but it seems to build fine without this, so this build-dep should be removed.
If it is actually used during the build, this seems wrong, as a package build
shouldn't be sending mail.

Cheers,

Ivo