patch 8.1.0146: when $LANG is set the compiler test may fail

Problem:    When $LANG is set the compiler test may fail.
Solution:   Unset $LANG.
diff --git a/src/version.c b/src/version.c
index ea289c7..cfc3b23 100644
--- a/src/version.c
+++ b/src/version.c
@@ -790,6 +790,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    146,
+/**/
     145,
 /**/
     144,