Adjust XFAIL

Author: ldionne

libcxx/test/std/input.output/file.streams/fstreams/filebuf.virtuals/setbuf.pass.cpp

@@ -10,8 +10,9 @@
 
 // basic_streambuf<charT, traits>* setbuf(char_type* s, streamsize n) override;
 
-// In C++23 and later, this test requires support for P2467R1 in the dylib (a3f17ba3febbd546f2342ffc780ac93b694fdc8d)
-// XFAIL: (!c++03 && !c++11 && !c++14 && !c++17 && !c++20) && using-built-library-before-llvm-18
+// This test requires the fix to https://github.com/llvm/llvm-project/issues/60509 in the dylib,
+// which landed in 5afb937d8a30445642ccaf33866ee4cdd0713222.
+// XFAIL: using-built-library-before-llvm-19
 
 #include <fstream>
 #include <cstddef>