discord: Add namespace and cleanup CMakeLists

3rdparty/discord-rpc/src/connection.h

@@ -0,0 +1,22 @@
+#pragma once
+
+// This is to wrap the platform specific kinds of connect/read/write.
+
+#include <cstdlib>
+
+namespace discord_rpc {
+
+// not really connectiony, but need per-platform
+int GetProcessId();
+
+struct BaseConnection {
+  static BaseConnection *Create();
+  static void Destroy(BaseConnection *&);
+  bool isOpen { false };
+  bool Open();
+  bool Close();
+  bool Write(const void *data, size_t length);
+  bool Read(void *data, size_t length);
+};
+
+} // namespace discord_rpc