I don't have a programmers.txt but I did find this in the avr.conf. I tried putting in V2 but it gave me a syntax error.
ATtiny85
#------------------------------------------------------------
part
id = "t85";
desc = "ATtiny85";
has_debugwire = yes;
flash_instr = 0xB4, 0x02, 0x12;
eeprom_instr = 0xBB, 0xFF, 0xBB, 0xEE, 0xBB, 0xCC, 0xB2,
0x0D,
0xBC, 0x02, 0xB4, 0x02, 0xBA, 0x0D, 0xBB, 0xBC,
0x99, 0xE1, 0xBB, 0xAC;
no STK500
devcode in XML file, use the ATtiny45 one
stk500_devcode = 0x14;## avr910_devcode = ?;