patch 8.0.0691: compiler warning without the linebreak feature

Problem:    Compiler warning without the linebreak feature.
Solution:   Add #ifdef. (John Marriott)

Author: brammool

src/edit.c

@@ -7329,7 +7329,9 @@ oneleft(void)
 #ifdef FEAT_VIRTUALEDIT
     if (virtual_active())
     {
+# ifdef FEAT_LINEBREAK
 	int width;
+# endif
 	int v = getviscol();
 
 	if (v == 0)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    691,
 /**/
     690,
 /**/