2001-04-18  Egor Duda  <deo@logos-m.ru>

	* dlmalloc.c: New file. Port of Doug Lea's malloc
	* dlmalloc.h: Ditto.
	* Makefile.in: Add support for MALLOC_DEBUG
	* config.h.in: Ditto.
	* winsup.h: Ditto.
	* configure.in: Add --enable-malloc-debugging option.
	* configure: Regenerate.
	* debug.h: Include declarations for debugging malloc.
	* tty.cc (grantpt): Fix definition.
	(unlockpt): Ditto.
	* include/sys/socket.h: Fix path to features.h