[libcxx] [test] Remove XFAIL LIBCXX-WINDOWS-FIXME from time.clock.file/now.pass.cpp

This doesn't fail when _LIBCPP_HAS_NO_INT128 is defined consistently
in both CMAKE_CXX_FLAGS and LIBCXX_TEST_COMPILER_FLAGS; the XFAIL was
added based on early CI testruns where that flag was missing in
LIBCXX_TEST_COMPILER_FLAGS.

Differential Revision: https://reviews.llvm.org/D99705

GitOrigin-RevId: 46e992f90500914443e2eea25b258d0b0276811f
diff --git a/test/std/utilities/time/time.clock/time.clock.file/now.pass.cpp b/test/std/utilities/time/time.clock/time.clock.file/now.pass.cpp
index a8f8472..9bc0477 100644
--- a/test/std/utilities/time/time.clock/time.clock.file/now.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.file/now.pass.cpp
@@ -17,8 +17,6 @@
 // UNSUPPORTED: with_system_cxx_lib=macosx10.10
 // UNSUPPORTED: with_system_cxx_lib=macosx10.9
 
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 // <chrono>
 
 // file_clock