patch 8.2.2933: when 'clipboard' is "unnamed" zp does not work correctly

Problem:    When 'clipboard' is "unnamed" zp and zP do not work correctly.
Solution:   Pass -1 to str_to_reg() and fix computing the character width
            instead of using the byte length. (Christian Brabandt,
            closes #8301, closes #8317)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2933,
 /**/
     2932,
 /**/