macosx: go back to the IB2 nib file format

It obviously can be opened by IB2 again and is a lot smaller (136 kB compared to 640 kB). Right now, we can't use any IB3 features anyway...

Makefile.am

@@ -84,6 +84,8 @@ ChangeLog: Makefile.am
 ###############################################################################
 
 EXTRA_DIST += \
+	extras/package/macosx/Resources/English.lproj/MainMenu.nib/classes.nib \
+	extras/package/macosx/Resources/English.lproj/MainMenu.nib/info.nib \
 	extras/package/macosx/Resources/English.lproj/MainMenu.nib/keyedobjects.nib \
 	extras/package/macosx/Resources/English.lproj/MediaInfo.nib/classes.nib \
 	extras/package/macosx/Resources/English.lproj/MediaInfo.nib/info.nib \