bug#53423: nncp: Fails to build (renamed file not found)

[Ivan Vilata i Balaguer <ivan@selidor.net>]

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Hi!  When trying to upgrade package `nncp 7.5.0` from Guix commit `404f6953`
to that of commit `4a943cfd`, the build fails showing this error:

```
phase `unpack' succeeded after 0.1 seconds
starting phase `go-unpack'
i/o error: src: No such file or directory
error: in phase 'go-unpack': uncaught exception:
system-error "rename-file" "~A" ("No such file or directory") (2) 
phase `go-unpack' failed after 0.0 seconds
Backtrace:
          10 (primitive-load "/gnu/store/lm25qs8vcxx69hn1rj47pjypc9m…")
In guix/build/gnu-build-system.scm:
    904:2  9 (gnu-build #:source _ #:outputs _ #:inputs _ #:phases . #)
In ice-9/boot-9.scm:
  1752:10  8 (with-exception-handler _ _ #:unwind? _ # _)
In srfi/srfi-1.scm:
    634:9  7 (for-each #<procedure 7ffff4889300 at guix/build/gnu-b…> …)
In ice-9/boot-9.scm:
  1752:10  6 (with-exception-handler _ _ #:unwind? _ # _)
In guix/build/gnu-build-system.scm:
   925:23  5 (_)
In ice-9/eval.scm:
    619:8  4 (_ #(#(#<directory (guile-user) 7ffff5fdbc80>) "/gnu/…"))
In ice-9/boot-9.scm:
   260:13  3 (for-each #<procedure 7ffff490c280 at ice-9/eval.scm:3…> …)
In unknown file:
           2 (rename-file "src/vendor/go.cypherpunks.ru/balloon" "..…")
In ice-9/boot-9.scm:
  1685:16  1 (raise-exception _ #:continuable? _)
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure rename-file: No such file or directory

Some deprecated features have been used.  Set the environment
variable GUILE_WARN_DEPRECATED to "detailed" and rerun the
program to get more information.  Set it to "no" to suppress
this message.
```

Looks like some bundled dependency is no longer there?  Attaching the whole
`/var/log/guix/drvs/rq/p7xarf62882g2n31mgq3z2g616i5hy-nncp-7.5.0.drv.bz2`.

Thanks a lot!

-- 
Ivan Vilata i Balaguer -- https://elvil.net/

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