patch 8.1.1133: compiler warning for uninitialized struct member

Problem:    Compiler warning for uninitialized struct member. (Yegappan
            Lakshmanan)
Solution:   Add initializer field.
diff --git a/src/globals.h b/src/globals.h
index adf98f2..6f4144a 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -320,7 +320,7 @@
 EXTERN int	garbage_collect_at_exit INIT(= FALSE);
 
 // Script CTX being sourced or was sourced to define the current function.
-EXTERN sctx_T	current_sctx INIT(= {0 COMMA 0 COMMA 0});
+EXTERN sctx_T	current_sctx INIT(= {0 COMMA 0 COMMA 0 COMMA 0});
 #endif
 
 EXTERN int	did_source_packages INIT(= FALSE);