[libcxx] [test] Exclude domain socket tests on windows, like freebsd/darwin

[ldionne]

LGTM with the comment rewording applied.

libcxx/test/support/filesystem_test_helper.h

159

// Some platforms don't support socket files [...]

libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.status/status.pass.cpp

struct TestCase {
       file_type expect_type;
     } cases[] = {
         {static_env.File, file_type::regular},
         {static_env.SymlinkToFile, file_type::regular},
         {static_env.Dir, file_type::directory},
         {static_env.SymlinkToDir, file_type::directory},
         // Block files tested elsewhere
         {static_env.CharFile, file_type::character},
-#if !defined(__APPLE__) && !defined(__FreeBSD__) // No support for domain sockets
+#if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(_WIN32) // No support for domain sockets
         {env.create_socket("socket"), file_type::socket},
 #endif
         {env.create_fifo("fifo"), file_type::fifo}
     };
     for (const auto& TC : cases) {
         // test non-throwing case
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
         file_status st = status(TC.p, ec);

libcxx/test/std/input.output/filesystems/fs.op.funcs/fs.op.symlink_status/symlink_status.pass.cpp

TEST_CASE(symlink_status_file_types_test)
     } cases[] = {
         {static_env.BadSymlink, file_type::symlink},
         {static_env.File, file_type::regular},
         {static_env.SymlinkToFile, file_type::symlink},
         {static_env.Dir, file_type::directory},
         {static_env.SymlinkToDir, file_type::symlink},
         // Block files tested elsewhere
         {static_env.CharFile, file_type::character},
-#if !defined(__APPLE__) && !defined(__FreeBSD__) // No support for domain sockets
+#if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(_WIN32) // No support for domain sockets
         {env.create_socket("socket"), file_type::socket},
 #endif
         {env.create_fifo("fifo"), file_type::fifo}
     };
     for (const auto& TC : cases) {
         // test non-throwing case
         std::error_code ec = std::make_error_code(std::errc::address_in_use);
         file_status st = symlink_status(TC.p, ec);

libcxx/test/support/filesystem_test_helper.h

 #include <vector>
 #include <regex>
 
 #include "test_macros.h"
 #include "rapid-cxx-test.h"
 #include "format_string.h"
 
 // For creating socket files
-#if !defined(__FreeBSD__) && !defined(__APPLE__)
+#if !defined(__FreeBSD__) && !defined(__APPLE__) && !defined(_WIN32)
 # include <sys/socket.h>
 # include <sys/un.h>
 #endif
 
 namespace utils {
     inline std::string getcwd() {
         // Assume that path lengths are not greater than this.
         // This should be fine for testing purposes.
#endif
 
     std::string create_fifo(std::string file) {
         file = sanitize_path(std::move(file));
         int ret = ::mkfifo(file.c_str(), 0666); // rw-rw-rw- mode
         assert(ret == 0);
         return file;
     }
 
-  // OS X and FreeBSD doesn't support socket files so we shouldn't even
+  // Some platforms doesn't support socket files so we shouldn't even
   // allow tests to call this unguarded.
-#if !defined(__FreeBSD__) && !defined(__APPLE__)
+#if !defined(__FreeBSD__) && !defined(__APPLE__) && !defined(_WIN32)
     std::string create_socket(std::string file) {
         file = sanitize_path(std::move(file));
 
         ::sockaddr_un address;
         address.sun_family = AF_UNIX;
         assert(file.size() <= sizeof(address.sun_path));
         ::strncpy(address.sun_path, file.c_str(), sizeof(address.sun_path));
         int fd = ::socket(AF_UNIX, SOCK_STREAM, 0);