Reviewed by Cameron Zwarich.

        https://bugs.webkit.org/show_bug.cgi?id=22067
        [GTK] Sun Java plugin segfaults at PluginPackage::createPackage()

        null-check symbols loaded from plugin modules, initialize the function
        table (like Win already does) and update it with the latest
        additions. Adjust whitespace for easy diff'ing with the Win port code
        from which it was forked.

        This fixes crashes with libnspr4.so and any other plugins that don't
        provide the symbols we expect.

        * plugins/gtk/PluginPackageGtk.cpp:
        (WebCore::PluginPackage::fetchInfo):
        (WebCore::PluginPackage::load):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@38184 268f45cc-cd09-0410-ab3c-d52691b4dbfc