patch 9.0.0463: command line test leaves directory behind

Problem:    Command line test leaves directory behind.
Solution:   Use the "R" flag on the first mkdir(). (Dominique Pellé,
            closes #11127)

Author: dpelle

src/testdir/test_cmdline.vim

@@ -2149,7 +2149,7 @@ func Test_wildmenu_pum()
   call VerifyScreenDump(buf, 'Test_wildmenu_pum_13', {})
 
   " Directory name completion
-  call mkdir('Xnamedir/XdirA/XdirB', 'p')
+  call mkdir('Xnamedir/XdirA/XdirB', 'pR')
   call writefile([], 'Xnamedir/XfileA')
   call writefile([], 'Xnamedir/XdirA/XfileB')
   call writefile([], 'Xnamedir/XdirA/XdirB/XfileC')
@@ -2229,7 +2229,7 @@ func Test_wildmenu_pum()
   call VerifyScreenDump(buf, 'Test_wildmenu_pum_31', {})
 
   " Tests a directory name contained full-width characters.
-  call mkdir('Xnamedir/あいう', 'pR')
+  call mkdir('Xnamedir/あいう', 'p')
   call writefile([], 'Xnamedir/あいう/abc')
   call writefile([], 'Xnamedir/あいう/xyz')
   call writefile([], 'Xnamedir/あいう/123')

src/version.c

@@ -703,6 +703,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    463,
 /**/
     462,
 /**/