[libc++] Add <filesystem> to the min-mac macro header test

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@354932 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/libcxx/min_max_macros.sh.cpp b/test/libcxx/min_max_macros.sh.cpp
index 8351e57..4310294 100644
--- a/test/libcxx/min_max_macros.sh.cpp
+++ b/test/libcxx/min_max_macros.sh.cpp
@@ -101,6 +101,8 @@
 TEST_MACROS();
 #include <exception>
 TEST_MACROS();
+#include <filesystem>
+TEST_MACROS();
 #include <float.h>
 TEST_MACROS();
 #include <forward_list>