Adding thread.h -- unused but for b/w compatibility.

As requested by Bill Janssen.

Include/thread.h

+#ifndef Py_THREAD_H
+#define Py_THREAD_H
+
+/***********************************************************
+Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
+The Netherlands.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI or Corporation for National Research Initiatives or
+CNRI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior
+permission.
+
+While CWI is the initial source for this software, a modified version
+is made available by the Corporation for National Research Initiatives
+(CNRI) at the Internet address ftp://ftp.python.org.
+
+STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
+CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
+DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* Header file for old code (such as ILU) that includes "thread.h"
+   instead of "pythread.h", and might use the old function names. */
+
+#include "pythread.h"
+
+#define init_thread PyThread_init_thread
+#define start_new_thread PyThread_start_new_thread
+#ifndef __BEOS__
+#define exit_thread PyThread_exit_thread
+#define _exit_thread PyThread__exit_thread
+#endif
+#define get_thread_ident PyThread_get_thread_ident
+#define allocate_lock PyThread_allocate_lock
+#define free_lock PyThread_free_lock
+#define acquire_lock PyThread_acquire_lock
+#define release_lock PyThread_release_lock
+#define allocate_sema PyThread_allocate_sema
+#define free_sema PyThread_free_sema
+#define down_sema PyThread_down_sema
+#define up_sema PyThread_up_sema
+#define exit_prog PyThread_exit_prog
+#define _exit_prog PyThread__exit_prog
+#define create_key PyThread_create_key
+#define delete_key PyThread_delete_key
+#define get_key_value PyThread_get_key_value
+#define set_key_value PyThread_set_key_value
+
+#endif /* !Py_THREAD_H */