[Pkg-rust-maintainers] Processed: add forgotten patch tag

[Debian Bug Tracking System]

Processing commands for control at bugs.debian.org:

> tags 856109 + patch
Bug #856109 [src:rustc] rustc: Hardcoded Pre-Depends on multiarch-support
Added tag(s) patch.
> thanks
Stopping processing here.

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-- 
856109: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=856109
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