Add GetOSName() binding. Returns a string representing the current OS (untested on everything but Windows, should work for everything but BSD, for which I forget the switch off the top of my head)

src/LuaManager.cpp

@@ -968,6 +968,24 @@ extern const char *const version_time;
 LuaFunction( VersionDate, (RString) version_date );
 LuaFunction( VersionTime, (RString) version_time );
 
+static RString GetOSName()
+{
+	RString system;
+	#if defined(XBOX)
+		system = "Xbox";
+	#elif defined(WIN32) && !defined(XBOX)
+		system = "Windows";
+	#elif defined(LINUX)
+		system = "Linux";
+	#elif defined(DARWIN)
+		system = "Mac";
+	#else
+		system = "Unknown";
+	#endif
+	return system;
+}
+LuaFunction( GetOSName, GetOSName() );
+
 static float scale( float x, float l1, float h1, float l2, float h2 )
 {
 	return SCALE( x, l1, h1, l2, h2 );