Update obsolete header files:

* remove obsolete m-mutex header file
* mark m-concurrent, m-shared and m-i-shared as obsolete (They won't support new memory model)

m-concurrent.h

@@ -29,6 +29,10 @@
 #include "m-thread.h"
 #include "m-atomic.h"
 
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 201710L
+#warning The header m-concurrent.h is obsolete. Use m-shared-ptr header instead.
+#endif
+
 /* Define a protected concurrent container and its associated functions
    based on the given container.
    USAGE: CONCURRENT_DEF(name, type [, oplist_of_the_type]) */

m-i-shared.h

@@ -28,6 +28,10 @@
 #include "m-core.h"
 #include "m-atomic.h"
 
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 201710L
+#warning The header m-i-shared.h is obsolete. Use m-shared-ptr header instead.
+#endif
+
 M_BEGIN_PROTECTED_CODE
 
 /* Define the oplist of a intrusive shared pointer.

m-mutex.h

@@ -1,28 +0,0 @@
-/*
- * M*LIB - Thin Mutex & Thread wrapper (compatibility layer)
- *
- * Copyright (c) 2017-2025, Patrick Pelissier
- * All rights reserved.
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * + Redistributions of source code must retain the above copyright
- *   notice, this list of conditions and the following disclaimer.
- * + Redistributions in binary form must reproduce the above copyright
- *   notice, this list of conditions and the following disclaimer in the
- *   documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-#if defined(__GNUC__) && __GNUC__ >= 4
-#warning "m-mutex.h is an obsolete header. Use m-thread.h instead."
-#endif
-#include "m-thread.h"

m-shared.h

@@ -29,6 +29,10 @@
 #include "m-atomic.h"
 #include "m-genint.h"
 
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 201710L
+#warning The header m-shared.h is obsolete. Use m-shared-ptr header instead.
+#endif
+
 M_BEGIN_PROTECTED_CODE
 
 /* Define shared pointer and its function.