installer_cross: Drop support to build with autotools
Maintaining autotools based version of installer_cross is already turning to a burden, with no users for that support. (I still have a legacy nightly build system doing those, but it should be taken off anyway).
Maintaining autotools based version of installer_cross is already turning to a burden, with no users for that support. (I still have a legacy nightly build system doing those, but it should be taken off anyway).