patch 8.1.0699: compiler warning for uninitialized variable

Problem:    Compiler warning for uninitialized variable. (Tony Mechelynck)
Solution:   Add a dummy init.

src/edit.c

@@ -7970,7 +7970,7 @@ replace_do_bs(int limit_col)
     if (cc > 0)
     {
 #ifdef FEAT_TEXT_PROP
-	size_t	len_before;
+	size_t	len_before = 0;  // init to shut up GCC
 
 	if (curbuf->b_has_textprop)
 	{

src/version.c

@@ -799,6 +799,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    699,
 /**/
     698,
 /**/