Try to remove outdated files from the "distribution" folder

Clean directory and keep only the expected files with the current
version.

Otherwise we get strange errors about "duplicate modules" when
building after version was switched.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1915368 13f79535-47bb-0310-9956-ffa450edef68
1 file changed