frontend: Define WIN32_LEAN_AND_MEAN conditionally for ARM64

To avoid redefinition errors, define WIN32_LEAN_AND_MEAN conditionally
if not defined in win-ARM64 devices.

frontend/dialogs/OBSBasicFilters.cpp

@@ -30,7 +30,9 @@
 #include <QLineEdit>
 
 #ifdef _WIN32
+#ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN 1
+#endif
 #include <Windows.h>
 #endif
 

frontend/dialogs/OBSBasicInteraction.cpp

@@ -27,7 +27,9 @@
 #include <QInputEvent>
 
 #ifdef _WIN32
+#ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN 1
+#endif
 #include <Windows.h>
 #endif
 

frontend/dialogs/OBSBasicProperties.cpp

@@ -27,7 +27,9 @@
 #include <QPushButton>
 
 #ifdef _WIN32
+#ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN 1
+#endif
 #include <Windows.h>
 #endif