Revert "Enlarge the race window for some test cases"

This reverts commit 2a84d259.

Broke regression test on test_hwm.cpp.

tests/test_hwm.cpp

@@ -255,9 +255,7 @@ int test_inproc_bind_and_close_first (int send_hwm, int /* recv_hwm */)
 int main (void)
 {
     setup_test_environment();
-
-	no_race_tests_please() ;
-
+    
     int count;
 
     // Default values are 1000 on send and 1000 one receive, so 2000 total

tests/test_proxy.cpp

@@ -222,8 +222,6 @@ int main (void)
 {
     setup_test_environment ();
 
-	no_race_tests_please() ;
-
     void *ctx = zmq_ctx_new ();
     assert (ctx);
     // Control socket receives terminate command from main over inproc

tests/testutil.hpp

@@ -263,12 +263,6 @@ void setup_test_environment()
     _CrtSetReportFile( _CRT_ASSERT, _CRTDBG_FILE_STDERR );
 #   endif
 #endif
-	zmq_lb_race_window_2_size = 1 ;
-}
-
-void no_race_tests_please()
-{
-	zmq_lb_race_window_2_size = 0 ;
 }
 
 //  Provide portable millisecond sleep