we still want to support it, but there are too many bugs to claim that we support it right now. See #537
See #632 closes #545 closes #510 this makes #651 higher priority
See #537
* fix fstat wrong on darwin * move std.debug.global_allocator to std.debug.global_allocator_state and make it private * add std.debug.global_allocator as a pointer (to upgrade your zig code remove the '&')