More systematic file naming

[Bruno Haible]

This gets closer to a systematic naming of the *.m4 files of header
replacements. Only stdint.m4 and inttypes.m4 are not aligned.


2021-04-18  Bruno Haible  <bruno@clisp.org>

        More systematic file naming.
        * m4/ctype_h.m4: Renamed from m4/ctype.m4.
        * m4/threads_h.m4: Renamed from m4/threads.m4.
        * m4/uchar_h.m4: Renamed from m4/uchar.m4.

diff --git a/m4/threads_h.m4 b/m4/threads_h.m4
index 53ec6d5..adda3e6 100644
--- a/m4/threads_h.m4
+++ b/m4/threads_h.m4
@@ -1,4 +1,4 @@
-# threads.m4 serial 10
+# threads_h.m4 serial 10
 dnl Copyright (C) 2019-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
diff --git a/m4/uchar_h.m4 b/m4/uchar_h.m4
index 1923f17..55cc33a 100644
--- a/m4/uchar_h.m4
+++ b/m4/uchar_h.m4
@@ -1,4 +1,4 @@
-# uchar.m4 serial 20
+# uchar_h.m4 serial 20
 dnl Copyright (C) 2019-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
diff --git a/modules/ctype b/modules/ctype
index 0196dfa..60d7d5f 100644
--- a/modules/ctype
+++ b/modules/ctype
@@ -3,7 +3,7 @@ A <ctype.h> that conforms to C99.
 
 Files:
 lib/ctype.in.h
-m4/ctype.m4
+m4/ctype_h.m4
 
 Depends-on:
 extern-inline
diff --git a/modules/threads-h b/modules/threads-h
index 37cc6d8..0ea7a48 100644
--- a/modules/threads-h
+++ b/modules/threads-h
@@ -12,7 +12,7 @@ lib/windows-once.h
 lib/windows-cond.h
 lib/windows-tls.h
 lib/windows-initguard.h
-m4/threads.m4
+m4/threads_h.m4
 m4/threadlib.m4
 build-aux/config.rpath
 
diff --git a/modules/uchar b/modules/uchar
index a65fce2..e57ee99 100644
--- a/modules/uchar
+++ b/modules/uchar
@@ -3,7 +3,7 @@ A GNU-like <uchar.h>.
 
 Files:
 lib/uchar.in.h
-m4/uchar.m4
+m4/uchar_h.m4
 m4/stdint.m4
 
 Depends-on: