On Canon bodies and lens firmware 1.x, this lens identifies itself using
model number 150. Starting with firmware 2.x, this lens now identifies
itself using model number 368.
Exiv2 was correctly identifying the former but not the latter.
This commit also fixes a pre-existing bug in which exiv2 was not
correctly disambiguating lenses using model number 368.
Leonardo Brondani Schenkel