Bug#950629: support dependency checks when multiple gemspecs are present

[Pirate Praveen]

Package: gem2deb
version: 1.0.3
Severity: wishlist

Example packages ruby-flipper, ruby-elasticsearch. debian/gemspec 
symlink can be used only for a single gemspec. In case of multiple 
binaries built from same source package that is not sufficient to test 
dependencies of all binary packages. Current work around is to run the 
dependency checks manually in debian/tests/control