No lib_link directory is used any more

Change-Id: Ic21750744794b4721c28f4e2b23e5e5ca5d74db5
Schemes don't exist in a clean tree, so use targets

The intent hopefully is that the MobileLibreOffice project should be
buildable in a freshly cloned or otherwise clean tree, where Xcode has
not been used interactively (which automatically creates a scheme for
each target, it seems).

Change-Id: I690513ecf54bb824dd3c3b0ef1735cc5cdff6d60
Now we can re-add CustomTarget_MobileLibreOffice_app

Change-Id: Iefb00e72f2700503ea33a28c9f7e2150f0d1e06e