Add capability to set the default scheme

See merge request !510

Implement iterators on pointers

See merge request !507

Simplify Makefile and remove debug.

See merge request redox-os/relibc!506

Improve redox getdents impl and use syscall when applicable

See merge request !504

use unsafe blocks in `sync/`

See merge request !505

feat: ignore negative fd and clear its revents in poll(2)

See merge request !484

Use unsafe blocks in crypt.h implementation

See merge request !503

Use unsafe blocks in assert.h implementation

See merge request !502

Use unsafe blocks in arpa/inet.h implementation

See merge request !501

Fix the Redox OS test execution command

See merge request redox-os/relibc!500