mt_allocator.h: thread_id is unused in non threaded applications and now has a ifdef to remove...

2004-02-09  Stefan Olsson  <stefan@xapa.se>

	* include/ext/mt_allocator.h: thread_id is unused in non threaded
	applications and now has a ifdef to remove it completely on
	compilers without thread support. Include stdlib.h due to a
	compiler warning on getenv().

From-SVN: r77576