* dcrt0.cc (sigthread::init): Correct overzealous ifdef.

* exceptions.cc (call_handler): Avoid calling sigthread acquire lock.
* sigproc.h (sigthread): Comment out lock for now.
* sync.cc (muto::acquire): Add a minor optimization.

winsup/cygwin/dcrt0.cc

@@ -616,8 +616,8 @@ sigthread::init (const char *s)
 {
 #if 0 /* FIXME: Someday we'll need this for inter-thread signalling */
   lock = new_muto (FALSE, s);
-  id = GetCurrentThreadId ();
 #endif
+  id = GetCurrentThreadId ();
 }
 
 /* Take over from libc's crt0.o and start the application. Note the