Building GHC head with clang on Mavericks

[Kazu Yamamoto (=?iso-2022-jp?B?GyRCOzNLXE9CSScbKEI=?=)]

Hi Simon,

>>> I think he has forgotten, yes. But yeah do send the pull requests
>>> anyway,
>>> my last set got merged in.
>>
>> Done:
>> 	https://github.com/simonmar/happy/pull/13
>> 	https://github.com/simonmar/alex/pull/38
> 
> I've merged these and made new releases of Happy (1.19.2) and Alex
> (3.1.3).

I verified that this happy and alex can build GHC head on Mavericks.
Thank you!

--Kazu