* cygheap.cc (cygheap_init): Born again function.

(_cmalloc): Reorganize to accomodate muto locking.
(_cfree): Use muto lock to avoid multi-thread problems.
* cygheap.h (incygheap): Just use cygheap_max to find upper cygwin heap bounds.
* dcrt0.cc (dll_crt0_1): Reinstitute cygheap_init call.
* path.cc (getcwd): Just return cwdstuff::get result, allowing correct handling
of negative length.
(cwdstuff::get): Malloc a buffer if one is not available.

winsup/cygwin/dcrt0.cc

@@ -654,6 +654,7 @@ dll_crt0_1 ()
 
   threadname_init ();
   debug_init ();
+  cygheap_init ();	/* Initialize cygheap muto */
 
   regthread ("main", GetCurrentThreadId ());