Windows compliation flag

Author: gyuheon0h

datadog-crashtracker/src/runtime_callback.rs

@@ -311,6 +311,7 @@ pub unsafe fn clear_runtime_callback() {
 /// # Safety
 /// This function is intended to be called from signal handlers and must maintain
 /// signal safety. It does not perform any dynamic allocation.
+#[cfg(unix)]
 pub(crate) unsafe fn invoke_runtime_callback_with_writer<W: std::io::Write>(
     writer: &mut W,
 ) -> Result<(), std::io::Error> {
@@ -386,6 +387,7 @@ pub(crate) unsafe fn invoke_runtime_callback_with_writer<W: std::io::Write>(
 ///
 /// This function writes a RuntimeStackFrame directly as JSON without intermediate allocation.
 /// It must be signal-safe.
+#[cfg(unix)]
 unsafe fn emit_frame_as_json(
     writer: &mut dyn std::io::Write,
     frame: *const RuntimeStackFrame,