* exceptions.cc (unused_sig_wrapper): Eliminate unused parameter to asm.

* external.cc (cygwin_internal): Change CW_STRACE_ON to CW_STRACE_TOGGLE.
* strace.cc (strace::hello): Toggle strace on and off.
* sync.cc (muto::init): Renamed from constructor.
* sync.h (muto::new): Delete.
(muto::delete): Ditto.
(new_muto): Simplify.  Use muto.init for nearly everything.
* uinfo.cc (uinfo_init): Avoid closing a NULL handle.
* include/sys/cygwin.h (cygwin_getinfo_types): Rename CW_STRACE_OFF to
CW_STRACE_TOGGLE.  Delete CW_STRACE_OFF.
* include/sys/strace.h (strace): Add "inited" field.

winsup/cygwin/external.cc

@@ -206,7 +206,7 @@ cygwin_internal (cygwin_getinfo_types t, ...)
 #	  undef cr
 	}
 
-      case CW_STRACE_ON:
+      case CW_STRACE_TOGGLE:
 	{
 	  pid_t pid = va_arg (arg, pid_t);
 	  pinfo p (pid);
@@ -221,6 +221,7 @@ cygwin_internal (cygwin_getinfo_types t, ...)
 	      return (DWORD) -1;
 	    }
 	}
+
       case CW_CYGWIN_PID_TO_WINPID:
 	{
 	  pinfo p (va_arg (arg, pid_t));