mini_dump: Check for debugger before spawning a child

mini_dump: Clean up

mini_dump: Fix MSVC error

mini_dump: Silence MSVC warning C4700

Zero initialize deb_ev.

mini_dump: Add license info

src/yuzu/mini_dump.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
 #pragma once
 
 #include <windows.h>