Fixed absolute path for Sparkle framework, in accordance with Install documentation

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<td align="left">Commit from clavila</td>
        <td align="right">2012-03-16 18:16 CET</td>
      </tr></table>Fixed absolute path for Sparkle framework, in accordance with Install documentation

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        File name
        Revision
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        <td class="item">Adun</td>
        <td class="item">Adun.xcodeproj/project.pbxproj</td>
        <td class="itemrev"><a href="http://cvs.gna.org/viewcvs/adun/Adun/Adun.xcodeproj/project.pbxproj?rev=1.91&amp;content-type=text/vnd.viewcvs-markup">1.91</a></td>
        <td class="itemrev"><a href="http://cvs.gna.org/viewcvs/adun/Adun/Adun.xcodeproj/project.pbxproj?r1=1.91&amp;r2=1.92">&gt;&gt;&gt;</a></td>
        <td class="itemrev"><a href="http://cvs.gna.org/viewcvs/adun/Adun/Adun.xcodeproj/project.pbxproj?rev=1.92&amp;content-type=text/vnd.viewcvs-markup">1.92</a></td>
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