patch 8.1.1237: error for using "compl", reserved word in C++

Problem:    Error for using "compl", reserved word in C++.
Solution:   Rename to "complp". (suggestion by Ken Takata)
diff --git a/src/version.c b/src/version.c
index 0e91cc6..32fab93 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1237,
+/**/
     1236,
 /**/
     1235,