std.zig: finish updating to new I/O API

[andrewrk]

No description provided.

[andrewrk]

it's stuck waiting for qemu to execute big endian stuff:

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[alexrp]

Assuming this is a legitimate bug in your code and not a qemu bug, grab one of the command lines above and add e.g. -g 1234 before the path to the executable. Then run gdb and type target remote :1234 followed by c. You should now be able to Ctrl-C when it appears to be stuck.

[andrewrk]

it's not quiiite so simple, since it needs the parent process to participate in order to repro. but I have it reproing locally so just a matter of time before I solve it.