patch 9.0.1972: win32: missing '**' expansion test

Problem:  win32: missing '**' expansion test (after v9.0.1947)
Solution: Add test for MS-Windows

win32: Add "**" test

Vim supports "**" on MS-Windows. However, it is not tested by
`Test_glob_extended_bash`.

Unlike Unix, it doesn't use 'shell' and doesn't support {,} expansion.
So, I added as a separate test.

related: #13205
closes: #13250

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Ken Takata <kentkt@csc.jp>
diff --git a/src/version.c b/src/version.c
index d4cf8cc..1eb6264 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1972,
+/**/
     1971,
 /**/
     1970,