Initialize TLS manually on Redox as Linux does.

See merge request !340

wctype

See merge request !339

Update toolchain

See merge request !338

This also replaces all the assembly that previously used the AT&T style
with the (in my opinion) superior Intel syntax.

I tried prepending `.att_syntax prefix`, but that did not work...

Simplify gmtime_r() day-of-year calculation, correct comment

See merge request !311

Centralize page size info in platform abstraction

See merge request !334

Handle TCSETSW and TCSETSF in ioctl

Closes #168

See merge request !324

Convert test runner to rust

See merge request !333