[OpenBIOS] Allow building on Mac OS X

[BALATON Zoltan]

Hello,

I've seen your patches on the OpenBIOS mailing list, here are some 
comments.

* instead on disabling -Werror completely you may want to try 
-fno-strict-aliasing (and if possible only set it for the file which 
exhibits this problem but I'm not sure how to do that with the used build 
system). The usb driver came from coreboot and probably had this problem 
there already but I did not see these warnings. It may be a peculiarity of 
your compiler or build environment.

* At least on OS X 10.9 /bin/sh is the same as /bin/bash and 
/usr/bin/uname -m returns x86_64 (the same as I get on Linux) so these 
changes should not be needed. (I did not check on older versions though.) 
Are you running a 32 bit OS and compile for 64-bit target on that? Or do 
you have another version of these commands in your path overriding the 
system provided ones?

Regards,
BALATON Zoltan