AVR Support?

[mantielero]

Using `--os:any`: 
    
    
    $ nim c --os:any --exceptions:quirky -d:noSignalHandler -d:danger hello
    Hint: used config file 
'/home/jose/.choosenim/toolchains/nim-#devel/config/nim.cfg' [Conf]
    Hint: used config file 
'/home/jose/.choosenim/toolchains/nim-#devel/config/config.nims' [Conf]
    Hint: used config file '/home/jose/src/avr/nim/nim.cfg' [Conf]
    .
    /home/jose/.choosenim/toolchains/nim-#devel/lib/system/osalloc.nim(306, 10) 
Error: Port memory manager to your platform
    
    
    Run