Reviewed by Adam Roben.

        - fix http://bugs.webkit.org/show_bug.cgi?id=13565
          Change svn-create-patch to put LayoutTests in the end

        In addition to reordering test files under the LayoutTests directory so that they
        appear after source code files, this patch fixes an issue with prepare-ChangeLog
        if the first argument passed to it is a file name instead of a directory name.

        * Scripts/prepare-ChangeLog:
        (isGIT()): If first value in @dirs array is a file, use dirname() to get the directory.
        (isSVN()): Ditto.
        * Scripts/svn-create-patch:
        (generateFileList($\%\%\%)): Differentiate test files in the LayoutTests directory from
        source code files.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@21608 268f45cc-cd09-0410-ab3c-d52691b4dbfc