patch 8.0.1763: :argedit does not reuse an empty unnamed buffer

Problem:    :argedit does not reuse an empty unnamed buffer.
Solution:   Add the BLN_CURBUF flag and fix all the side effects. (Christian
            Brabandt, closes #2713)
diff --git a/src/version.c b/src/version.c
index 778419c..f5d4c5a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1763,
+/**/
     1762,
 /**/
     1761,