patch 8.0.1683: Python upgrade breaks Vim when defining PYTHON_HOME

Problem:    Python upgrade breaks Vim when defining PYTHON_HOME.
Solution:   Do not define PYTHON_HOME and PYTHON3_HOME in configure. (Naoki
            Inada, closes #2787)
diff --git a/src/version.c b/src/version.c
index 7cd61f3..9f1075e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1683,
+/**/
     1682,
 /**/
     1681,