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

See merge request !385

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

See merge request !384

signal add fewer more implementations

See merge request !378

setsid implementation

See merge request !381

cfmakeraw implementation proposal

See merge request !382

Add no-op tzset, plus required static vars

See merge request !383

fix no_mangle annotation missing

See merge request !377

signal add few missing implementations

See merge request !376

sync implementation

See merge request !375

unistd: fdatasync implementation.

See merge request !373

stdlib: unlockpt implementation proposal

See merge request !372

sys_resource: get/setpriority implementations.

See merge request redox-os/relibc!369

stdlib: getsubopt implementation proposal.

See merge request !371

sys_mman: adding madvise.

See merge request !370

Fix typos in setrlimit

See merge request !368

sys_resource: setrlimit implementation proposal.

See merge request !366

unistd: getdtablesize implementation proposal

See merge request !365

stdio: implements legacy cuserid proposal.

See merge request !362

sys_mman add further mmap/madvise flags.

See merge request !361

Fix symlinking on MacOS that doesn't have the -r option

See merge request !360