I have not seen anyone say that they have ported avr/io.h to Galileo. You can find the avr directory in the Arduino 1.05 release: Arduino/hardware/tools/avr/avr/include.
io.h is simple, most of it can be replaced with an empty file. The nested includes will be harder: avr/portpins.h, avr/common.h, avr/version.h, avr/fuse.h, and avr/lock.h.
Just remember if you are doing your own conversion - Galileo has neither fuses nor program storage.
If you get it working - post your results.
