patch 8.0.1552: may leak file descriptors when executing job

Problem:    May leak file descriptors when executing job.
Solution:   Close more file descriptors. (Ozaki Kiichi, closes #2531)
diff --git a/src/version.c b/src/version.c
index 389bbb1..48da8a3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -779,6 +779,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1552,
+/**/
     1551,
 /**/
     1550,