fixup! [libc++] Fix unnecessary flushes in std::print() on POSIX

Fix test for modules

Author: dimztimz

libcxx/test/libcxx/input.output/iostream.format/output.streams/ostream.formatted/ostream.formatted.print/vprint_unicode.pass.cpp

@@ -19,7 +19,7 @@
 // XFAIL: availability-print-missing
 
 // Clang modules do not work with the definiton of _LIBCPP_TESTING_PRINT_IS_TERMINAL
-// XFAIL: clang-modules-build
+// XFAIL: clang-modules-build && target={{.*}}-windows{{.*}}
 // <ostream>
 
 // Tests the implementation of