Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/src/testdir/test_normal.vim b/src/testdir/test_normal.vim
index 2d1446b..857294f 100644
--- a/src/testdir/test_normal.vim
+++ b/src/testdir/test_normal.vim
@@ -1313,7 +1313,7 @@
   norm! 0K
   call assert_equal('version8.txt', fnamemodify(bufname('%'), ':t'))
   call assert_equal('help', &ft)
-  call assert_match('\*version8\.0\*', getline('.'))
+  call assert_match('\*version8\.\d\*', getline('.'))
   helpclose
 
   set keywordprg=:new
diff --git a/src/testdir/test_xxd.vim b/src/testdir/test_xxd.vim
index 0ddcff0..6e67893 100644
--- a/src/testdir/test_xxd.vim
+++ b/src/testdir/test_xxd.vim
@@ -52,7 +52,11 @@
   " Test 5: Print 120 bytes as continuous hexdump with 20 octets per line
   let s:test += 1
   %d
-  exe '0r! ' . s:xxd_cmd . ' -l 120 -ps -c 20 ../../runtime/doc/xxd.1'
+  let fname = '../../runtime/doc/xxd.1'
+  if has('win32') && !filereadable(fname)
+    let fname = '../../doc/xxd.1'
+  endif
+  exe '0r! ' . s:xxd_cmd . ' -l 120 -ps -c 20 ' . fname
   $d
   let expected = [
       \ '2e54482058584420312022417567757374203139',
@@ -66,7 +70,7 @@
   " Test 6: Print the date from xxd.1
   let s:test += 1
   %d
-  exe '0r! ' . s:xxd_cmd . ' -s 0x36 -l 13 -c 13 ../../runtime/doc/xxd.1'
+  exe '0r! ' . s:xxd_cmd . ' -s 0x36 -l 13 -c 13 ' . fname
   $d
   call assert_equal('00000036: 3231 7374 204d 6179 2031 3939 36  21st May 1996', getline(1), s:Mess(s:test))