A couple of fixes/enhancements to update-webkit-*-libs

    A couple of fixes/enhancements to update-webkit-*-libs

        You can now specify WEBKITSUPPORTLIBRARIESZIPDIR=C:\my\special\place
        to tell update-webkit-support-libraries where it should find the
        WebKitSupportLibrary.zip file you downloaded.

        These scripts also now correctly interpret WEBKITLIBRARIESDIR as a
        Windows-style path.

        Reviewed by Sam.

        * Scripts/update-webkit-auxiliary-libs: Also renamed $supportLibsURL
        to $auxiliaryLibsURL and removed an irrelevant comment.
        * Scripts/update-webkit-support-libs:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@25725 268f45cc-cd09-0410-ab3c-d52691b4dbfc