Do not change the classpath in build.bat

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git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@267684 13f79535-47bb-0310-9956-ffa450edef68

build.bat

@@ -1,4 +1,5 @@
 @echo off
 REM convience bat file to build with
-if exist %JAVA_HOME%\lib\tools.jar set CLASSPATH=%CLASSPATH%;%JAVA_HOME%\lib\tools.jar
-java -classpath "%CLASSPATH%;lib\ant.jar" org.apache.tools.ant.Main %1 %2 %3 %4 %5
+set TOOLSJAR=
+if exist %JAVA_HOME%\lib\tools.jar set TOOLSJAR=%JAVA_HOME%\lib\tools.jar
+java -classpath "%CLASSPATH%;%TOOLSJAR%;lib\ant.jar" org.apache.tools.ant.Main %1 %2 %3 %4 %5