* 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.

winsup/cygwin/tty.cc

@@ -29,14 +29,14 @@ extern fhandler_tty_master *tty_master;
 
 extern "C"
 int
-grantpt (void)
+grantpt (int fd)
 {
   return 0;
 }
 
 extern "C"
 int
-unlockpt (void)
+unlockpt (int fd)
 {
   return 0;
 }