patch 8.0.1159: typo in #ifdef

Problem:    Typo in #ifdef.
Solution:   Change "PROT" to "PROTO". (Nobuhiro Takasaki, closes #2165)
diff --git a/src/version.c b/src/version.c
index f45ad7d..5724b9d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1159,
+/**/
     1158,
 /**/
     1157,