patch 8.0.1166: :terminal doesn't work on Mac High Sierra

Problem:    :terminal doesn't work on Mac High Sierra.
Solution:   Change #ifdef for OpenPTY(). (Ozaki Kiichi, Kazunobu Kuriyama,
            closes #2162)
diff --git a/src/version.c b/src/version.c
index b28cd91..f02ebe0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1166,
+/**/
     1165,
 /**/
     1164,