patch 8.0.0887: can create a logfile in the sandbox

Problem:    Can create a logfile in the sandbox.
Solution:   Disable ch_logfile() in the sandbox. (Yasuhiro Matsumoto)
diff --git a/src/version.c b/src/version.c
index 4e78e31..29703ed 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    887,
+/**/
     886,
 /**/
     885,