add stdout display in building script.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1095 bbd45198-f89e-11dd-88c7-29a3b14d5316

tools/building.py

@@ -226,7 +226,11 @@ class Win32Spawn:
             print "====="
             print err
             print "====="
-        return rv
+            return rv
+           
+        if data:
+            print data
+        return 0
 
 def PrepareBuilding(env, root_directory):
     import SCons.cpp