[test] Build error for javaws

When testing javaws, it will get build error:
BUILD FAILED
c:\deploy\test\functional\buildjavaws.xml:2837: The following error occurred whi
le executing this line:
c:\deploy\test\functional\buildjavaws.xml:1954: The following error occurred whi
le executing this line:
c:\deploy\test\functional\share.xml:838: Unable to delete file C:\apache-tomcat-
6.0.26\bin\tcnative-1.dll

This is due to that the tcnative-1.dll file is still used by tomcat in cleanup-after.
Fix: remove <delete file="${TOMCAT_HOME}/bin/tcnative-1.dll"/> to cleanup-before