Fix build with Windows 10 20348 SDK

Bug: chromium:1292528
Change-Id: If4da2ec92afb7b4fe9942778eca385344b9b6409
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3563539
Auto-Submit: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79709}

src/base/cpu.cc

@@ -764,9 +764,11 @@ CPU::CPU()
   // user-space.
   has_non_stop_time_stamp_counter_ = true;
 
-  // Defined in winnt.h, but in a newer version of the Windows SDK than the one
-  // that V8 requires, so we must copy the value here.
+  // Defined in winnt.h, but only in 10.0.20348.0 version of the Windows SDK.
+  // Copy the value here to support older versions as well.
+#if !defined(PF_ARM_V83_JSCVT_INSTRUCTIONS_AVAILABLE)
   constexpr int PF_ARM_V83_JSCVT_INSTRUCTIONS_AVAILABLE = 44;
+#endif
 
   has_jscvt_ =
       IsProcessorFeaturePresent(PF_ARM_V83_JSCVT_INSTRUCTIONS_AVAILABLE);