Add option to the build script to optimize always
Add option to the build script to optimize always

Currently always set with gcc/clang as -O0 causes compile errors.

neivv/teippi,neivv/teippi,neivv/teippi,nekoshota/teippi_DecayOfEternity,nekoshota/teippi_DecayOfEternity,nekoshota/teippi_DecayOfEternity,neivv/teippi,nekoshota/teippi_DecayOfEternity