json: Compilation on Windows fails because symlinks end up being files containing a path

   Compiling gstreamer v0.18.0 (https://gitlab.freedesktop.org/gstreamer/gstreamer-rs#0e435578)
error: expected item, found `..`
 --> text\json\src\line_reader.rs:1:1
  |
1 | ../../../video/closedcaption/src/line_reader.rs
  | ^^ expected item

error[E0432]: unresolved import `crate::line_reader::LineReader`
  --> text\json\src\jsongstparse\imp.rs:31:5
   |
31 | use crate::line_reader::LineReader;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `LineReader` in `line_reader`

For more information about this error, try `rustc --explain E0432`.
error: could not compile `gst-plugin-json` due to 2 previous errors

CC @meh