patch 8.0.0811: MS-Windows: test_expand_dllpath fails

Problem:    MS-Windows: test_expand_dllpath fails.
Solution:   Change backslashes to forward slashes
diff --git a/src/testdir/test_expand_dllpath.vim b/src/testdir/test_expand_dllpath.vim
index b3e099a..1542095 100644
--- a/src/testdir/test_expand_dllpath.vim
+++ b/src/testdir/test_expand_dllpath.vim
@@ -6,7 +6,8 @@
     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 = ''
diff --git a/src/version.c b/src/version.c
index fa67f7f..90d9273 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    811,
+/**/
     810,
 /**/
     809,