patch 8.1.0539: cannot build without the sandbox
Problem: Cannot build without the sandbox.
Solution: Set the secure option instead of using the sandbox. Also restrict
the characters from 'spelllang' that are used for LANG.vim.
(suggested by Yasuhiro Matsumoto)
diff --git a/src/version.c b/src/version.c
index 8569417..a6f155f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
+ 539,
+/**/
538,
/**/
537,