signal adding sig(timed)wait implementations

See merge request redox-os/relibc!392

Fixing wcsrtombs

See merge request redox-os/relibc!391

clock_getres/clock_settime additions

See merge request redox-os/relibc!389

Implementing ungetwc

See merge request redox-os/relibc!390

Adding `wcsrtombs`.

Closes #166

See merge request redox-os/relibc!388

fix tzset cbindgen declarations

See merge request redox-os/relibc!386

Fix mspaces not being protected by locks.

See merge request redox-os/relibc!387

termios adding cfsetspeed bsd extension which set both __c_ispeed/__c_ospeed fields

See merge request redox-os/relibc!385

Fix platform::errno = ... in signal.rs

See merge request redox-os/relibc!384

signal add fewer more implementations

See merge request redox-os/relibc!378

setsid implementation

See merge request redox-os/relibc!381

cfmakeraw implementation proposal

See merge request redox-os/relibc!382

Add no-op tzset, plus required static vars

See merge request redox-os/relibc!383

fix no_mangle annotation missing

See merge request redox-os/relibc!377

signal add few missing implementations

See merge request redox-os/relibc!376

sync implementation

See merge request redox-os/relibc!375

unistd: fdatasync implementation.

See merge request redox-os/relibc!373

stdlib: unlockpt implementation proposal

See merge request redox-os/relibc!372

sys_resource: get/setpriority implementations.

See merge request redox-os/relibc!369