patch 8.1.1908: every popup window consumes a buffer number

Problem:    Every popup window consumes a buffer number.
Solution:   Recycle buffers only used for popup windows.  Do not list popup
            window buffers.

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1908,
 /**/
     1907,
 /**/