[clang-repl] XFAIL new const.cpp test on Windows

Still failing after the previous commit:
https://lab.llvm.org/buildbot/#/builders/216/builds/28268

Author: hahnjo

clang/test/Interpreter/const.cpp

@@ -1,4 +1,7 @@
 // UNSUPPORTED: system-aix
+// see https://github.com/llvm/llvm-project/issues/68092
+// XFAIL: system-windows
+
 // RUN: cat %s | clang-repl | FileCheck %s
 // RUN: cat %s | clang-repl -Xcc -O2 | FileCheck %s