* cygtls.cc (_cygtls::init_exception_handler): Semi-revert to making only

ourselves the exception handler and nothing else.
* exceptions.cc (open_stackdumpfile): Use correct format specifiers for unicode
when printing nameof stackdump file.
(stack_info::walk): Stop walking if ebp points into cygwin itself.
(_cygtls::handle_exceptions): Detect when signal is masked and treat as if it
was not caught.  Reinitialize exception handler to known state to avoid
subsequent attempts to call Windows exception handlers if an exception occurs
in a signal handler.  Revert to a 'return 0' rather than using a goto.
* strfuncs.cc (sys_wcstombs_alloc): Minor formatting tweak.
* winsup.h: Fix comment typo.

winsup/cygwin/winsup.h

@@ -149,7 +149,7 @@ extern int dynamically_loaded;
 
 extern int cygserver_running;
 
-#define _MT_SAFE	// DELTEME someday
+#define _MT_SAFE	// DELETEME someday
 
 #define TITLESIZE 1024