dlang packages should not depend on i686

[dlangBugzillaToGithub]

Martin Nowak (@MartinNowak) reported this on 2013-12-04T15:35:59Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=11688

Description

The linux packages come with cross compile support for X86_32 by default.
This feature is rarely needed but creates a package dependency on a complete gcc multiarch toolchain.
It makes these packages annoying to use for continuous integration systems like travis-ci where you have to install dmd before every test run.

I think we should offer the 64/32 cross compiler dmd as separate package on dlang.org/downloads.