patch 8.0.0811: MS-Windows: test_expand_dllpath fails

Problem:    MS-Windows: test_expand_dllpath fails.
Solution:   Change backslashes to forward slashes

Author: brammool

src/testdir/test_expand_dllpath.vim

@@ -6,7 +6,8 @@ func s:test_expand_dllpath(optname)
     execute 'call assert_equal("' . $TEST_EXPAND_DLLPATH . '", &' . a:optname . ')' 
 
     execute 'set ' . a:optname . '=~' . $TEST_EXPAND_DLLPATH
-    execute 'call assert_equal("' . $HOME . $TEST_EXPAND_DLLPATH . '", &' . a:optname . ')' 
+    let home = substitute($HOME, '\\', '/', 'g')
+    execute 'call assert_equal("' . home . $TEST_EXPAND_DLLPATH . '", &' . a:optname . ')' 
   finally
     execute 'let &' . a:optname . ' = dllpath_save'
     let $TEST_EXPAND_DLLPATH = ''

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    811,
 /**/
     810,
 /**/