patch 8.2.4405: compiler warning for unused variable without +folding

Problem:    Compiler warning for unused variable without the +folding feature.
            (Tony Mechelynck)
Solution:   Add #ifdef.

src/change.c

@@ -552,8 +552,9 @@ changed_common(
     {
 	if (wp->w_buffer == curbuf)
 	{
+#ifdef FEAT_FOLDING
 	    linenr_T last = lnume + xtra - 1;  // last line after the change
-
+#endif
 	    // Mark this window to be redrawn later.
 	    if (wp->w_redr_type < VALID)
 		wp->w_redr_type = VALID;

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4405,
 /**/
     4404,
 /**/