[libc++] Add missing REQUIRES for exception handling test

ldionne · ldionne · commit 2b7cca1ccfea · 2023-11-27T15:04:04.000-05:00
It otherwise fails on Windows.
diff --git a/libcxx/test/std/algorithms/alg.nonmodifying/alg.all_of/pstl.exception_handling.pass.cpp b/libcxx/test/std/algorithms/alg.nonmodifying/alg.all_of/pstl.exception_handling.pass.cpp
@@ -8,6 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-exceptions
+// REQUIRES: has-unix-headers
 
 // UNSUPPORTED: libcpp-has-no-incomplete-pstl
 
