COMPMOD_RESPREFIX=abp was unused ever since initial commit in 2001.

COMPMOD_NAMESPACE was used to set the namespace name qualifier of
the helper in componentmodule.hxx to the extension's namespace name.

I don't see why this is necessary as the helper is always compiled in
a separate extension library.

Change-Id: I287607008db3dc0ebc32731536747a921c91807d
Reviewed-on: https://gerrit.libreoffice.org/39184Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>