Update libcxx/include/__config

Author: Zingam

libcxx/include/__config

@@ -1199,7 +1199,6 @@ typedef __char32_t char32_t;
 #  endif
 
 // TODO(LLVM 22): Remove this macro once LLVM19 support ends. __cpp_explicit_this_parameter has been set in LLVM20
-// https://github.com/llvm/llvm-project/pull/107451
 // Clang-18 has support for deducing this, but it does not set the FTM.
 #  if defined(__cpp_explicit_this_parameter) || (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 1800)
 #    define _LIBCPP_HAS_EXPLICIT_THIS_PARAMETER 1