wrong arc colour when using linecolor in PDFs

[r4lv]

Let's take this example:

{
  network one {
      linecolor=green;
      A;
      x;
  }
  network two {
      B1;
      B2;
  }
  network three {
      linecolor=red;
      x;
  }
}

While the SVG output looks as expected, the PDF output has black arc segments instead of coloured ones. I marked them with a purple circle in the screenshots below:

I'm preparing a PR to address this.