Draft: Resolve "lib_com/tools_fx.c: Replace (exotic) mac_ro operator by round_fx+L_mac"
Reason why this change is needed
The exotic operator mac_ro should be eliminated in order to reduce the number of used operators. It is used only in one single line in lib_com/tools_fx.c
Description of the change
The operator should be replaced by round_fx_o aand L_add_o()
- Describe what is done. The changes are fully bit-exact to the legacy code, no significant change in complexity.