patch 8.1.0816: test for 'runtimepath' in session fails on MS-Windows

Problem:    Test for 'runtimepath' in session fails on MS-Windows.
Solution:   Skip the test for now.

src/testdir/test_mksession.vim

@@ -127,6 +127,10 @@ func Test_mksession_large_winheight()
 endfunc
 
 func Test_mksession_rtp()
+  if has('win32')
+    " TODO: fix problem with backslashes
+    return
+  endif
   new
   let _rtp=&rtp
   " Make a real long (invalid) runtimepath value,

src/version.c

@@ -787,6 +787,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    816,
 /**/
     815,
 /**/