scripting: add a way to run sub processes as "scripts"

This is just a more convenient way to start IPC client scripts per mpv
instance.

Does not work on Windows, although it could if the subprocess and IPC
parts are implemented (and I guess .exe/.bat suffixes are required).
Also untested whether it builds on Windows. A lot of other things are
untested too, so don't complain.

1 files changed, 6 insertions, 0 deletions

diff --git a/input/ipc-win.c b/input/ipc-win.c
index 727a8cca73..9672ec85fe 100644
--- a/input/ipc-win.c
+++ b/input/ipc-win.c
@@ -335,6 +335,12 @@ static void ipc_start_client_json(struct mp_ipc_ctx *ctx, int id, HANDLE h)
     ipc_start_client(ctx, client);
 }
 
+bool mp_ipc_start_anon_client(struct mp_ipc_ctx *ctx, struct mpv_handle *h,
+                              int out_fd[2])
+{
+    return false;
+}
+
 static void *ipc_thread(void *p)
 {
     // Use PIPE_TYPE_MESSAGE | PIPE_READMODE_BYTE so message framing is