patch 9.2.0281: tests: Test_netrw_FileUrlEdit.. fails on Windows

Problem:  tests: Test_netrw_FileUrlEdit.. fails on Windows
          (after 3e60f03d94)
Solution: Skip the test on Windows (Yasuhiro Matsumoto).

The Test_netrw_FileUrlEdit_pipe_injection() test fails on Windows with
E303 because '|' is not a valid filename character on Windows.  Since
the pipe character cannot appear in a Windows filename, the command
injection vector this test guards against does not apply on Windows.

closes: #19890

Signed-off-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_plugin_netrw.vim

@@ -596,6 +596,7 @@ func Test_netrw_hostname()
 endfunc
 
 func Test_netrw_FileUrlEdit_pipe_injection()
+  CheckUnix
   CheckExecutable id
   let fname = 'Xtestfile'
   let url = 'file:///tmp/file.md%7C!id>'..fname

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    281,
 /**/
     280,
 /**/