Don't use dllexport/dllimport/visibility("default") with winelib

All of these are useless, because the set of symbols to export is
determined by the def file and the set of symbols to import is
determined by whatever undefined symbols are left after linking the
object files together. Silence various warnings about these being
ignored.

src/d3d9/d3d9_include.h

@@ -10,12 +10,7 @@
 #include <stdint.h>
 #include <d3d9.h>
 
-//for some reason we need to specify __declspec(dllexport) for MinGW
-#if defined(__WINE__)
-#define DLLEXPORT __attribute__((visibility("default")))
-#else
 #define DLLEXPORT
-#endif
 
 
 #include "../util/com/com_guid.h"

src/dxgi/dxgi_include.h

@@ -1,9 +1,7 @@
 #pragma once
 
 //for some reason we need to specify __declspec(dllexport) for MinGW
-#if defined(__WINE__)
-  #define DLLEXPORT __attribute__((visibility("default")))
-#elif defined(_MSC_VER)
+#if defined(_MSC_VER) || defined(__WINE__)
   #define DLLEXPORT
 #else
   #define DLLEXPORT __declspec(dllexport)

src/dxvk/dxvk_openvr.cpp

@@ -5,8 +5,19 @@
 #pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
 #endif
 
+#ifdef __WINE__
+
+#pragma push_macro("_WIN32")
+// don't use dllimport with winelib, it's useless
+#undef _WIN32
+#endif
+
 #include <openvr/openvr.hpp>
 
+#ifdef __WINE__
+#pragma pop_macro("_WIN32")
+#endif
+
 using VR_InitInternalProc        = vr::IVRSystem* (VR_CALLTYPE *)(vr::EVRInitError*, vr::EVRApplicationType);
 using VR_ShutdownInternalProc    = void  (VR_CALLTYPE *)();
 using VR_GetGenericInterfaceProc = void* (VR_CALLTYPE *)(const char*, vr::EVRInitError*);