RCC: (Re-)introduce a way to build resources in one go

This is essentially an opt-out using CONFIG += resources_small for the
'big-data' feature introduced and made mandatory with commit 5395180.

This is currently not active in any configuration, but can be used
when the two-pass approach is neither needed nor wanted.

Change-Id: I6d4f663843e629da6f39ac4da5e77d39c58b3ddf
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>