Error when using ``c`` and installing dependency with ``bin``
Strange error whenever trying to build a binary in my project and I just added another dep on `jwt` (which depends on another package with a `bin` spec):

```
nimble c src/auth_server.nim                                                                                 1 ↵
  Verifying dependencies for auth@0.1.0
      Info: Dependency on norm@>= 1.0.17 already satisfied
  Verifying dependencies for norm@1.0.17
      Info: Dependency on ndb@>= 0.19.5 already satisfied
  Verifying dependencies for ndb@0.19.7
      Info: Dependency on jester@any version already satisfied
  Verifying dependencies for jester@0.4.3
      Info: Dependency on httpbeast@>= 0.2.2 already satisfied
  Verifying dependencies for httpbeast@0.2.2
      Info: Dependency on https://github.com/timotheecour/asynctools@#pr_fix_compilation already satisfied
  Verifying dependencies for asynctools@#pr_fix_compilation
      Info: Dependency on https://github.com/timotheecour/asynctools@#pr_fix_compilation already satisfied
  Verifying dependencies for asynctools@#pr_fix_compilation
      Info: Dependency on oauth@#e76bd37f6bc8832231ff720745a4dfc0ea1504d5 already satisfied
  Verifying dependencies for oauth@#e76bd37f6bc8832231ff720745a4dfc0ea1504d5
      Info: Dependency on sha1@any version already satisfied
  Verifying dependencies for sha1@1.1
 Installing jwt@#af1f26c49b0c993fa550a93f3fd50f4b63ba6585
Downloading https://github.com/yglukhov/nim-jwt.git using git
  Verifying dependencies for jwt@#af1f26c49b0c993fa550a93f3fd50f4b63ba6585
 Installing https://github.com/yglukhov/linktools@any version
Downloading https://github.com/yglukhov/linktools using git
  Verifying dependencies for linktools@0.1.0
      Info: Dependency on cligen@any version already satisfied
  Verifying dependencies for cligen@#head
 Installing linktools@0.1.0
       Tip: 28 messages have been suppressed, use --verbose to show them.
     Error: No binaries built, did you specify a valid binary name?
```