patch 8.2.0673: cannot build Haiku in shadow directory

Problem:    Cannot build Haiku in shadow directory.
Solution:   Add symlink. (Ozaki Kiichi, closes #6023)
diff --git a/src/version.c b/src/version.c
index 140871c..7267318 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    673,
+/**/
     672,
 /**/
     671,