patch 8.1.2321: cannot select all text with the mouse

Problem:    Cannot select all text with the mouse. (John Marriott)
Solution:   Move limiting the mouse column to f_getmousepos(). (closes #5242)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2321,
 /**/
     2320,
 /**/