patch 8.0.1686: Python does not work when configuring with specific dir

Problem:    Python does not work when configuring with specific dir. (Rajdeep)
Solution:   Do define PYTHON_HOME and PYTHON3_HOME in configure if the Python
            config dir was specified.
diff --git a/src/version.c b/src/version.c
index ff8d0c4..08b6728 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1686,
+/**/
     1685,
 /**/
     1684,