Made sure env vars are cleaned and CLASSPATH is not decorated with extra " characters. It is expected that if CLASSPATH is set that it is valid and thus the extra "'s are uneeded.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268570 13f79535-47bb-0310-9956-ffa450edef68

src/script/ant.bat

@@ -55,7 +55,7 @@ goto end
 
 :checkJava
 set _JAVACMD=%JAVACMD%
-set LOCALCLASSPATH="%CLASSPATH%"
+set LOCALCLASSPATH=%CLASSPATH%
 for %%i in ("%ANT_HOME%\lib\*.jar") do call "%ANT_HOME%\bin\lcp.bat" "%%i"
 
 if "%JAVA_HOME%" == "" goto noJavaHome
@@ -85,6 +85,7 @@ goto end
 
 :end
 set LOCALCLASSPATH=
+set _JAVACMD=
 set ANT_CMD_LINE_ARGS=
 
 if not "%OS%"=="Windows_NT" goto mainEnd