* exceptions.cc (signal_exit): Kill any executing child process if we're dying.

* path.h: Remove unneeded extern.
* spawn.cc (std_suffixes): Make static.  Don't set dwProcessId here since it
makes the process unsignalable.  Set strace flag that this is an execed process
stub.
* strace.cc (strace::vsprntf): Use strace flag to indicate when to visually
flag that this is an exec stub.
* include/sys/strace.h (strace): Add 'execing' flag.

winsup/cygwin/strace.cc

@@ -133,10 +133,8 @@ strace::vsprntf (char *buf, const char *func, const char *infmt, va_list ap)
       if ((p = strrchr (progname, '.')) != NULL && strcasematch (p, ".exe"))
 	*p = '\000';
       p = progname;
-      count = __small_sprintf (buf, fmt, p && *p ? p : "?",
-			       myself->pid,
-			       myself->dwProcessId != GetCurrentProcessId ()
-			       ? "!" : "");
+      count = __small_sprintf (buf, fmt, p && *p ? p : "?", myself->pid,
+			       execing ? "!" : "");
       if (func)
 	count += getfunc (buf + count, func);
     }
@@ -177,6 +175,8 @@ strace::write (unsigned category, const char *buf, int count)
   __small_sprintf (outbuf, "cYg%08x", strlen (outstuff) + 1);
   outstuff[-1] = ' ';
   OutputDebugString (outbuf);
+#undef outstuff
+#undef PREFIX
 }
 
 /* Printf function used when tracing system calls.