macosx: fix compilation with Xcode 6.3

extras/package/macosx/Resources/English.lproj/About.xib

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="8191" systemVersion="14F27" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none">
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="9058" systemVersion="14F1017" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none">
     <dependencies>
-        <deployment version="1060" identifier="macosx"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="8191"/>
-        <capability name="box content view" minToolsVersion="7.0"/>
+        <deployment version="1070" identifier="macosx"/>
+        <development version="6300" identifier="xcode"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="9058"/>
     </dependencies>
     <objects>
         <customObject id="-2" userLabel="File's Owner" customClass="AboutWindowController">
@@ -24,7 +24,7 @@
             </connections>
         </customObject>
         <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
-        <customObject id="-3" userLabel="Application"/>
+        <customObject id="-3" userLabel="Application" customClass="NSObject"/>
         <window title="About VLC media player" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" visibleAtLaunch="NO" frameAutosaveName="" animationBehavior="default" id="1345" userLabel="About">
             <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES"/>
             <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
@@ -123,7 +123,7 @@ Help and join us!.</string>
                     <box autoresizesSubviews="NO" title="Box" borderType="line" titlePosition="noTitle" id="2313">
                         <rect key="frame" x="-10" y="-9" width="747" height="90"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
-                        <view key="contentView" id="ri7-JS-38w">
+                        <view key="contentView">
                             <rect key="frame" x="1" y="1" width="745" height="88"/>
                             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                             <subviews>