[WK2] [GTK] WK2 testing bot unable to find the InjectedBundle library

[WK2] [GTK] WK2 testing bot unable to find the InjectedBundle library
https://bugs.webkit.org/show_bug.cgi?id=90541

Reviewed by Carlos Garcia Campos.

We must add the contents of WebKitBuild/*/Libraries/ directory to
the file to be uploaded to b.w.o to successfully run WebKit2 tests
in the WebKit2 testing bot.

* BuildSlaveSupport/built-product-archive:
(archiveBuiltProduct): appended Libraries to the list of
neededDirectories.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121840 268f45cc-cd09-0410-ab3c-d52691b4dbfc