Pipe changes throughout suggested by Eric Fifer <EFifer@sanwaint.com>

* debug.cc (threadname_init): Pass name of lock as arg 2 of new_muto.
* malloc.cc (malloc_init): Ditto.
* sigproc.cc (sigproc_init): Ditto.
* exceptions.cc (events_init): Ditto.
(call_handler): Eliminate special case for hExeced.  Report locked thread in
debugging output.
* fhandler.cc (fhandker_pipe::fhandler_pipe): Propagate device type to base
class.
* fhandler.h (fhandler_pipe): Ditto.
* hinfo.cc (hinfo::build_fhandler): Pass specific type of pipe to constructor.
* spawn.cc (spawn_guts): Eliminate dependency on signal when waiting for
subprocess.
* strace.cc: Remove obsolete #ifdef.
* sync.cc (muto::muto): Save the name of the muto.
(muto:~muto): Also release the muto.
* sync.h: Add a muto name field.
* select.cc (peek_pipe): Avoid doing a PeekNamedPipe on the write end of a
pipe.

winsup/cygwin/sigproc.cc

@@ -616,7 +616,7 @@ sigproc_init ()
   /* sync_proc_subproc is used by proc_subproc.  It serialises
    * access to the children and zombie arrays.
    */
-  sync_proc_subproc = new_muto (FALSE, NULL);
+  sync_proc_subproc = new_muto (FALSE, "sync_proc_subproc");
 
   /* Initialize waitq structure for main thread.  A waitq structure is
    * allocated for each thread that executes a wait to allow multiple threads