patch 8.1.0364: compiler warning in xdiff code

Problem:    Compiler warning in xdiff code. (Yegappan Lakshmanan)
Solution:   Initialize directly.

src/version.c

@@ -794,6 +794,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    364,
 /**/
     363,
 /**/

src/xdiff/README.txt

@@ -11,4 +11,6 @@ And since it's part of git it is expected to be reliable.
 The code is distributed under the GNU LGPL license.  It is included in the
 COPYING file.
 
+Changes in these files were made to avoid compiler warnings.
+
 The first work for including xdiff in Vim was done by Christian Brabandt.

src/xdiff/xemit.c

@@ -169,7 +169,9 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
 	long s1, s2, e1, e2, lctx;
 	xdchange_t *xch, *xche;
 	long funclineprev = -1;
-	struct func_line func_line = { 0 };
+	struct func_line func_line;
+
+	func_line.len = 0;
 
 	for (xch = xscr; xch; xch = xche->next) {
 		xche = xdl_get_hunk(&xch, xecfg);