Build media and live-kit in test-mode on non-MacOS (#6859)

Build media and live-kit in test-mode on non-MacOS (Related to
https://github.com/zed-industries/zed/issues/5391
https://github.com/zed-industries/zed/issues/5395
https://github.com/zed-industries/zed/issues/5394)

This makes it possible to build the media and live-kit crates on
non-MacOS

Release Notes:

- N/A

crates/media/build.rs

@@ -1,6 +1,7 @@
-use std::{env, path::PathBuf, process::Command};
-
+#[cfg(target_os = "macos")]
 fn main() {
+    use std::{env, path::PathBuf, process::Command};
+
     let sdk_path = String::from_utf8(
         Command::new("xcrun")
             .args(["--sdk", "macosx", "--show-sdk-path"])
@@ -37,3 +38,6 @@ fn main() {
         .write_to_file(out_path.join("bindings.rs"))
         .expect("couldn't write dispatch bindings");
 }
+
+#[cfg(not(target_os = "macos"))]
+fn main() {}

crates/media/src/bindings.rs

@@ -3,6 +3,8 @@
 #![allow(non_snake_case)]
 #![allow(unused)]
 
+#[cfg(target_os = "macos")]
 use objc::*;
 
+#[cfg(target_os = "macos")]
 include!(concat!(env!("OUT_DIR"), "/bindings.rs"));

crates/media/src/media.rs

@@ -3,12 +3,14 @@
 
 mod bindings;
 
+#[cfg(target_os = "macos")]
 use core_foundation::{
     base::{CFTypeID, TCFType},
     declare_TCFType, impl_CFTypeDescription, impl_TCFType,
 };
 use std::ffi::c_void;
 
+#[cfg(target_os = "macos")]
 pub mod io_surface {
     use super::*;
 
@@ -27,6 +29,7 @@ pub mod io_surface {
     }
 }
 
+#[cfg(target_os = "macos")]
 pub mod core_video {
     #![allow(non_snake_case)]
 
@@ -206,6 +209,7 @@ pub mod core_video {
     }
 }
 
+#[cfg(target_os = "macos")]
 pub mod core_media {
     #![allow(non_snake_case)]
 
@@ -413,6 +417,7 @@ pub mod core_media {
     }
 }
 
+#[cfg(target_os = "macos")]
 pub mod video_toolbox {
     #![allow(non_snake_case)]