Build failure on directory.nimble CI service
https://nimble.directory/ci/badges/c2nim/nimdevel/output.html

```
Build output from c2nim

Built on 2018-08-29T08:29:19+00:00

** Install test timed out after 240 seconds **

    Reading official package list
Downloading https://github.com/nim-lang/c2nim using git
  Executing git clone --recursive --depth 1 https://github.com/nim-lang/c2nim /tmp/nimble_5988/githubcom_nimlangc2nim
   Finished with exit code 0
     Output Cloning into '/tmp/nimble_5988/githubcom_nimlangc2nim'...
    Setting Nim stdlib prefix to /usr
    Setting Nim stdlib path to /usr/lib/nim
  Verifying dependencies for c2nim@0.9.13
    Reading official package list
   Checking for compiler@#53ce58f050247
      Info: Dependency on compiler@#53ce58f050247 already satisfied
    Setting Nim stdlib prefix to /usr
    Setting Nim stdlib path to /usr/lib/nim
  Verifying dependencies for compiler@#53ce58f050247
 Installing c2nim@0.9.13
   Building c2nim/c2nim using c backend
  Executing "/usr/bin/nim" c --noBabelPath -d:release --path:"/var/lib/nim_package_directory/cache/c2nim/pkgs/compiler-#53ce58f050247"  -o:"/tmp/nimble_5988/githubcom_nimlangc2nim/c2nim" "/tmp/nimble_5988/githubcom_nimlangc2nim/c2nim.nim"
   Finished with exit code 0
     Output Hint: used config file '/etc/nim.cfg' [Conf]
        ... Hint: system [Processing]
        ... Hint: c2nim [Processing]
        ... Hint: strutils [Processing]
        ... Hint: parseutils [Processing]
        ... Hint: math [Processing]
        ... Hint: algorithm [Processing]
        ... Hint: os [Processing]
        ... Hint: times [Processing]
        ... Hint: posix [Processing]
        ... Hint: ospaths [Processing]
        ... Hint: parseopt [Processing]
        ... Hint: llstream [Processing]
        ... Hint: ast [Processing]
        ... Hint: lineinfos [Processing]
        ... Hint: ropes [Processing]
        ... Hint: hashes [Processing]
        ... Hint: tables [Processing]
        ... Hint: nversion [Processing]
        ... Hint: options [Processing]
        ... Hint: strtabs [Processing]
        ... Hint: osproc [Processing]
        ... Hint: streams [Processing]
        ... Hint: cpuinfo [Processing]
        ... Hint: linux [Processing]
        ... Hint: sets [Processing]
        ... Hint: platform [Processing]
        ... Hint: prefixmatches [Processing]
        ... Hint: terminal [Processing]
        ... Hint: macros [Processing]
        ... Hint: strformat [Processing]
        ... Hint: unicode [Processing]
        ... Hint: colors [Processing]
        ... Hint: termios [Processing]
        ... Hint: sha1 [Processing]
        ... Hint: idents [Processing]
        ... Hint: wordrecg [Processing]
        ... Hint: intsets [Processing]
        ... Hint: idgen [Processing]
        ... Hint: renderer [Processing]
        ... Hint: lexer [Processing]
        ... Hint: msgs [Processing]
        ... Hint: nimlexbase [Processing]
        ... Hint: clex [Processing]
        ... Hint: configuration [Processing]
        ... clex.nim(20, 19) Warning: configuration is deprecated [Deprecated]
        ... Hint: cparse [Processing]
        ... Hint: pegs [Processing]
```