vim-patch:8.2.2589: recover test hangs in the GUI

Problem:    Recover test hangs in the GUI.
Solution:   Add g:skipped_reason to skip a _nocatch_ test.

776b954622

Now always skip the test as test_override() is N/A.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/testdir/runtest.vim

@@ -174,7 +174,12 @@ func RunTheTest(test)
   if a:test =~ 'Test_nocatch_'
     " Function handles errors itself.  This avoids skipping commands after the
     " error.
+    let g:skipped_reason = ''
     exe 'call ' . a:test
+    if g:skipped_reason != ''
+      call add(s:messages, '    Skipped')
+      call add(s:skipped, 'SKIPPED ' . a:test . ': ' . g:skipped_reason)
+    endif
   else
     try
       let s:test = a:test

src/nvim/testdir/test_recover.vim

@@ -82,10 +82,18 @@ func Test_swap_file()
 endfunc
 
 func Test_nocatch_process_still_running()
+  let g:skipped_reason = 'test_override() is N/A'
+  return
   " sysinfo.uptime probably only works on Linux
-  CheckLinux
+  if !has('linux')
+    let g:skipped_reason = 'only works on Linux'
+    return
+  endif
   " the GUI dialog can't be handled
-  CheckNotGui
+  if has('gui_running')
+    let g:skipped_reason = 'only works in the terminal'
+    return
+  endif
 
   " don't intercept existing swap file here
   au! SwapExists