[DRE-maint] Bug#1101319: ruby-thor: Drop unused B-D: ruby-fakeweb

[Bastian Germann]

Source: ruby-thor
Version: 1.3.2-2
Severity: normal
X-Debbugs-Cc: lucas at debian.org

The Build-Depends: ruby-fakeweb is not used and makes that package a key
package unnecessarily. Please drop it.