Handle infinity and NaN in printf

See merge request redox-os/relibc!252

added ctime_r

See merge request redox-os/relibc!250

Implement wcsstr(), fix return type of wcslen()

See merge request !249

sys/uio.h: include sys/types.h

See merge request !244

lcg48 refactor

See merge request !243

Refactor of a64l and l64a

See merge request redox-os/relibc!242

Fix few warnings

See merge request redox-os/relibc!236

Make program_invocation_name modifiable

See merge request redox-os/relibc!240

needed for ssize_t

libiconv expects program_invocation_name to be an lvalue

Fix invalid memory reference in signal and sigaction

See merge request !239

The sigaction handler called map on an option, creating a pointer to a
move value. This in turned caused UB for signal handlers. Avoid using
pointers directly, and instead prefer references.

I didn't think it'd be this useful first, but thank god for `cargo fix --edition`!