Problems on non-PPC Big-Endian machines

[thelusiv]

Corresponding with this bug report on Debian's bugtracker: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=376740

The "asm" constraint used on line 78 of include/model.h only seems to work on PPC, so we need to figure out some alternative to this so that VDrift can be built on other big-endian platforms like Sparc.

I really don't know how to fix this, I'll look into it in a little while, because this is blocking VDrift from being adopted into Debian stable (and lots of other OS's along with it). If anyone else has any insight to share on this matter we'd be happy to hear it.