[PATCH] Fix wchar_h.m4 serial number

[Sam James]

Remove duplicate serial number specification (the latter of which is invalid)
and increment the serial to reflect this change.

(It's easier for some work I'm doing if each serial maps to one checksum
of the macro, and serial #s are free.)

* m4/wchar_h.m4: Remove duplicate serial number specification and increment
  serial.
---
 m4/wchar_h.m4 | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/m4/wchar_h.m4 b/m4/wchar_h.m4
index a7b660defd..995bdc659d 100644
--- a/m4/wchar_h.m4
+++ b/m4/wchar_h.m4
@@ -1,5 +1,5 @@
 # wchar_h.m4
-# serial 1
+# serial 64
 dnl Copyright (C) 2007-2024 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -9,8 +9,6 @@ dnl A placeholder for ISO C99 <wchar.h>, for platforms that 
have issues.
 
 dnl Written by Eric Blake.
 
-# wchar_h.m4 serial 63
-
 AC_DEFUN_ONCE([gl_WCHAR_H],
 [
   AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
-- 
2.44.0