os2: process API for Darwin and most of it for BSDs

core/os/os2/process_posix_other.odin

@@ -13,3 +13,16 @@ _process_list :: proc(allocator: runtime.Allocator) -> (list: []int, err: Error)
 	err = .Unsupported
 	return
 }
+
+_process_open :: proc(pid: int, flags: Process_Open_Flags) -> (process: Process, err: Error) {
+	err = .Unsupported
+	return
+}
+
+_process_handle_still_valid :: proc(p: Process) -> Error {
+	return nil
+}
+
+_process_state_update_times :: proc(p: Process, state: ^Process_State) {
+	return
+}