[core, desktop] "fixes" from building on mxe/x86_64-w64-mingw32 (#396)

* well, i couldn't build the executable, but in anyway those build
  errors can come back later to bite our backs
* include missing include
* safeguard _MSC_VER only headers

* saw some of those changes on another PR but I cant find it at moment

Signed-off-by: Caio Oliveira <caiooliveirafarias0@gmail.com>

Reviewed-on: #396
Reviewed-by: crueter <crueter@eden-emu.dev>
Co-authored-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Co-committed-by: Caio Oliveira <caiooliveirafarias0@gmail.com>

src/core/file_sys/vfs/vfs_real.cpp

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -442,11 +445,12 @@ std::vector<VirtualFile> RealVfsDirectory::GetFiles() const {
 FileTimeStampRaw RealVfsDirectory::GetFileTimeStamp(std::string_view path_) const {
     const auto full_path = FS::SanitizePath(path + '/' + std::string(path_));
     const auto fs_path = std::filesystem::path{FS::ToU8String(full_path)};
-    struct stat file_status;
 
 #ifdef _WIN32
+    struct _stat64 file_status;
     const auto stat_result = _wstat64(fs_path.c_str(), &file_status);
 #else
+    struct stat file_status;
     const auto stat_result = stat(fs_path.c_str(), &file_status);
 #endif
 

src/core/hle/service/nifm/nifm.cpp

@@ -21,6 +21,7 @@
 #include <atomic>
 #include <chrono>
 #include <mutex>
+#include <optional>
 #include <thread>
 #include <unordered_set>
 #include <common/settings.h>
@@ -32,8 +33,10 @@
 #undef interface
 #include <wlanapi.h>
 #pragma pop_macro("interface")
+#ifdef _MSC_VER
 #pragma comment(lib, "wlanapi.lib")
 #endif
+#endif
 
 namespace {
 

src/core/hle/service/nvnflinger/hardware_composer.cpp

@@ -4,6 +4,8 @@
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
+#include <optional>
+
 #include <boost/container/small_vector.hpp>
 
 #include "core/hle/service/nvdrv/devices/nvdisp_disp0.h"

src/core/internal_network/emu_net_state.cpp

@@ -10,8 +10,10 @@
 #define NOMINMAX
 #include <windows.h>
 #include <wlanapi.h>
+#ifdef _MSC_VER
 #pragma comment(lib, "wlanapi.lib")
 #endif
+#endif
 #include <common/settings.h>
 
 #include <mutex>

src/core/internal_network/wifi_scanner.cpp

@@ -15,8 +15,10 @@ using namespace std::chrono_literals;
 #define NOMINMAX
 #include <windows.h>
 #include <wlanapi.h>
+#ifdef _MSC_VER
 #pragma comment(lib, "wlanapi.lib")
 #endif
+#endif
 
 namespace Network {
 #ifdef ENABLE_WIFI_SCAN

src/yuzu/main.cpp

@@ -178,7 +178,9 @@ static FileSys::VirtualFile VfsDirectoryCreateFileWrapper(const FileSys::Virtual
 #include <QPlatformSurfaceEvent>
 #include <dwmapi.h>
 #include <windows.h>
+#ifdef _MSC_VER
 #pragma comment(lib, "Dwmapi.lib")
+#endif
 
 static inline void ApplyWindowsTitleBarDarkMode(HWND hwnd, bool enabled) {
     if (!hwnd)