vim-patch:8.1.1526: no numerical value for the patchlevel

Problem:    No numerical value for the patchlevel.
Solution:   Add v:versionlong.

37df9a4401

Restore "highest_patch()" solely for "v:versionlong".
Copy/paste Test_vvar_scriptversion2() from patch 9.1.1540.
It works without ":scriptversion 2".
In general, if Vim's test works with ":scriptversion 1", just port it
for additional coverage.

---

vim-patch:8.1.1565: MS-Windows: no sound support

Problem:    MS-Windows: no sound support.
Solution:   Add sound support for MS-Windows. (Yasuhiro Matsumoto, Ken Takata,
            closes vim/vim#4522)

9b283523f2

----

"sound" feature is N/A now but this updates "v:versionlong" docs.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/eval.h

@@ -162,6 +162,7 @@ typedef enum {
   VV_TYPE_BOOL,
   VV_TYPE_BLOB,
   VV_EVENT,
+  VV_VERSIONLONG,
   VV_ECHOSPACE,
   VV_ARGV,
   VV_COLLATE,