add system check and block on new windows versions

src/sys_check.cpp

@@ -0,0 +1,46 @@
+#include "./sys_check.hpp"
+
+// use message boxes to notify the user of system failure
+#include <SDL3/SDL.h>
+
+#include <cstdlib>
+
+#if defined(_WIN32) || defined(WIN32)
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+
+#include <windows.h>
+
+typedef LONG NTSTATUS, *PNTSTATUS;
+#define STATUS_SUCCESS (0x00000000)
+
+void runSysCheck(void) {
+	NTSTATUS(WINAPI *RtlGetVersion)(LPOSVERSIONINFOEXW);
+	OSVERSIONINFOEXW osInfo;
+
+	*(FARPROC*)&RtlGetVersion = GetProcAddress(GetModuleHandleA("ntdll"), "RtlGetVersion");
+
+	if (NULL != RtlGetVersion) {
+		osInfo.dwOSVersionInfoSize = sizeof(osInfo);
+		RtlGetVersion(&osInfo);
+
+		// check
+		if (
+			osInfo.dwBuildNumber >= 26000 // canary versions of 11 24H2 included
+		) {
+			SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Unsupported System", "Your version of windows is too new and endangers the privacy of all involved.", nullptr);
+			exit(0);
+		}
+	}
+}
+
+#else
+
+void runSysCheck(void) {
+	// do nothing
+}
+
+#endif
+