Disable BrokenSymlink pre-commit hook for this repo

The AppVeyor testing environment has failures when running this
particular hook in a 64-bit environment. This isn't worth the time to
investigate, so disable the hook for now.

Example build failure:
https://ci.appveyor.com/project/brigade/overcommit/build/job/u45ju8kf8swoj1rw

Author: sds

.overcommit.yml

@@ -1,6 +1,10 @@
 gemfile: Gemfile
 
 PreCommit:
+  # Disabled since this causes spurious failures on AppVeyor builds
+  BrokenSymlinks:
+    enabled: false
+
   BundleCheck:
     enabled: true