Removing thread.h -- it has been obsolete for quite a while.

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 */