[Bug 25905] never call debian/control rule and build this file during the build

[Jeff Bailey]

Public bug report changed:
https://launchpad.net/malone/bugs/25905

Changed in: cdbs (upstream)
       Assignee: (unassigned) => Jeff Bailey

Comment:
CDBS should handle this case gracefully.  Specifically, 

1) debian/rules debian/control should fail hard unless an environment variable is set.  

2) The rule should be called automatically.

This will cause an FTBFS on the buildd where the debian/control file is out of date while still preserving the autogenerate function for maintainers who like this feature.