patch build.bat to set the NT error code if bootstrapping failed, to be consistent with the build.sh script.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@452919 13f79535-47bb-0310-9956-ffa450edef68

build.bat

@@ -21,6 +21,8 @@ if exist bootstrap\lib\ant.jar if exist bootstrap\bin\ant.bat if exist bootstrap
 call bootstrap.bat
 if exist bootstrap\lib\ant.jar if exist bootstrap\bin\ant.bat if exist bootstrap\bin\lcp.bat if exist bootstrap\bin\antRun.bat goto runAnt
 echo Bootstrap FAILED
+REM set the error code
+color 00
 goto cleanup
 
 :runAnt