[libc++][tests] Update XFAIL annotations for some tests on Windows (llvm#149124)

These tests still fail on Windows with clang-22, as reported in llvm#70225.
This started failing due to the version bump to Clang 22.

Author: ilovepi

libcxx/test/libcxx/fuzzing/random.pass.cpp

@@ -6,9 +6,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-// This test fails because Clang no longer enables -fdelayed-template-parsing
-// by default on Windows with C++20 (#69431).
-// XFAIL: msvc && (clang-18 || clang-19 || clang-20 || clang-21)
+// This doesn't work on Windows because in the MSVC UCRT headers the math.h is
+// actually intended to implement the full C++ spec requirements. For details
+// see https://github.com/llvm/llvm-project/issues/70225#issuecomment-1992528828
+// XFAIL: msvc
 
 // UNSUPPORTED: c++03, c++11
 

libcxx/test/std/depr/depr.c.headers/math_h.pass.cpp

@@ -6,9 +6,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-// This test fails because Clang no longer enables -fdelayed-template-parsing
-// by default on Windows with C++20 (#69431).
-// XFAIL: msvc && (clang-18 || clang-19 || clang-20 || clang-21)
+// This doesn't work on Windows because in the MSVC UCRT headers the math.h is
+// actually intended to implement the full C++ spec requirements. For details
+// see https://github.com/llvm/llvm-project/issues/70225#issuecomment-1992528828
+// XFAIL: msvc
 
 // <math.h>
 

libcxx/test/std/numerics/c.math/cmath.pass.cpp

@@ -6,9 +6,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-// This test fails because Clang no longer enables -fdelayed-template-parsing
-// by default on Windows with C++20 (#69431).
-// XFAIL: msvc && (clang-18 || clang-19 || clang-20 || clang-21)
+// This doesn't work on Windows because in the MSVC UCRT headers the math.h is
+// actually intended to implement the full C++ spec requirements. For details
+// see https://github.com/llvm/llvm-project/issues/70225#issuecomment-1992528828
+// XFAIL: msvc
 
 // <cmath>