Change vectorlike from struct to union

* src/lisp.h (vectorlike_headed): Change from struct to union.
All uses changed.  Since it has only one member, this does not
change semantics.  This is designed to simplify future changes
needed to fix bugs like Bug#29040.  All uses changed.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/termhooks.h b/src/termhooks.h
index dd6044aabd5..fe4e993c968 100644
--- a/src/termhooks.h
+++ b/src/termhooks.h
@@ -373,7 +373,7 @@ extern struct tty_display_info *gpm_tty;
 struct terminal
 {
   /* This is for Lisp; the terminal code does not refer to it.  */
-  struct vectorlike_header header;
+  union vectorlike_header header;
 
   /* Parameter alist of this terminal.  */
   Lisp_Object param_alist;