tweak _WIN32_WINNT value for shellscalingapi.h present but no d3d12

src/core/windows/SDL_windows.h

@@ -33,10 +33,12 @@
 #undef WINVER
 #define WINVER 0x0501
 #undef _WIN32_WINNT
-#if !defined(SDL_VIDEO_RENDER_D3D12)
-#define _WIN32_WINNT  0x501   /* Need 0x410 for AlphaBlend() and 0x500 for EnumDisplayDevices(), 0x501 for raw input */
-#else
+#if defined(SDL_VIDEO_RENDER_D3D12)
 #define _WIN32_WINNT  0xA00   /* For D3D12, 0xA00 is required */
+#elif defined(HAVE_SHELLSCALINGAPI_H)
+#define _WIN32_WINNT  0x603   /* For DPI support */
+#else
+#define _WIN32_WINNT  0x501   /* Need 0x410 for AlphaBlend() and 0x500 for EnumDisplayDevices(), 0x501 for raw input */
 #endif
 #endif