Rename `trace_linux.odin` to `trace_cpp.odin`

core/debug/trace/trace_linux.odin → core/debug/trace/trace_cpp.odin

@@ -1,5 +1,5 @@
 //+private file
-//+build linux
+//+build linux, darwin
 package debug_trace
 
 import "base:intrinsics"

core/debug/trace/trace_nil.odin

@@ -1,4 +1,4 @@
-//+build !windows !linux
+//+build !windows !linux !darwin
 package debug_trace
 
 _Context :: struct {