Close mic with two hyper-cardoid small diaphragm condensers, one pointed slightly off center towards the 12th fret, and another slightly off center towards the sound hole. The tight cardoid-polar pattern will reject most off axis breathing noise.
Alternatively, close pic with one hyper-cardoid small diaphragm condenser pointed at the sweet spot (that will require experimentation to find), and use a large diaphragm condenser mic about 6-to-8 feet away to pic up the room sound (the breathing noise should be mitigated at that distance).
Either way … breath quietly … or make it part of your signature sound (a la’ Ian Anderson’s flute solos). 