__ATOMIC_SEQ_CST undeclared on BeOS

[coolcoder613eb]

I am trying to compile w2c2 on BeOS, but there are a lot of errors about that in w2c2_base.h.

[turbolent]

This is probably because the new threading related code added in #90 isn't properly gated using ifdefs, it currently assumes that a recent GCC (>=4.7) is used.

I'll try to have a look at it this weekend.

[SamuraiCrow]

Thanks for looking into this. I know BeOS uses GCC 2.95 so it cannot be on GCC 4+.

[coolcoder613eb]

I managed to get it to build a few days ago, and ported RustPython to BeOS.