patch 8.1.1767: FEAT_SESSION defined separately

Problem:    FEAT_SESSION defined separately.
Solution:   Make FEAT_SESSION depend on FEAT_EVAL.
diff --git a/src/version.c b/src/version.c
index 4e155e9..496a2ee 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1767,
+/**/
     1766,
 /**/
     1765,