compiler: add constructor/fallback to the ABI if using an old compiler
compiler: add constructor/fallback to the ABI if using an old compiler

soad003/browser-solidity,Yann-Liang/browser-solidity,ethereum/browser-solidity,Yann-Liang/browser-solidity,serapath-contribution/browser-solidity,serapath-contribution/browser-solidity,ethereum/browser-solidity,serapath-contribution/browser-solidity,soad003/browser-solidity,soad003/browser-solidity,Yann-Liang/browser-solidity