Add missing files.

UnleashedRecomp/kernel/platform.cpp

@@ -0,0 +1,24 @@
+#include <kernel/platform.h>
+
+#if _WIN32
+LIB_FUNCTION(LONG, "ntdll.dll", RtlGetVersion, PRTL_OSVERSIONINFOW);
+#endif
+
+PlatformVersion GetPlatformVersion()
+{
+    auto result = PlatformVersion{};
+
+#if _WIN32
+    OSVERSIONINFOEXW osvi = { 0 };
+    osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);
+
+    if (RtlGetVersion((PRTL_OSVERSIONINFOW)&osvi) != 0)
+        return result;
+
+    result.Major = osvi.dwMajorVersion;
+    result.Minor = osvi.dwMinorVersion;
+    result.Build = osvi.dwBuildNumber;
+#endif
+
+    return result;
+}