NO_WALLET: Don't download/build/cache libs needed to enable the wallet
NO_UPNP: Don't download/build/cache packages needed for enabling upnp
DEBUG: disable some optimizations and enable more runtime checking
-USE_LINUX_STATIC_QT5: Build a static qt5 rather than shared qt4. Linux only.
If some packages are not built, for example 'make NO_WALLET=1', the appropriate
options will be passed to bitcoin's configure. In this case, --disable-wallet.