Comment 5 for bug 673085

Something like the attached patch should do it. I'm still building to see if it works though.

There's a couple of bigger problems though if we want to do it right:
 * There's code in corelib/arch/armv6/qatomic*.c that may also being used
 * qatomic_armv6.h includes code for RVCT which should be fixed by someone
 * The code may not work on multi-processor systems like Panda due to the lack of DMB instructions

The better fix would be to replace everything with __sync_* primitives similar to qatomic_avr32.h and require GCC 4.4 or higher.

In progress...