Add empty locale functions

Cargo.lock

Cargo.toml

include/bits/locale.h

src/lib.rs

src/locale/Cargo.toml

src/locale/build.rs

src/locale/cbindgen.toml

src/locale/src/lib.rs

src/stdio/src/lib.rs

tests/.gitignore

tests/Makefile

tests/expected/locale.stderr

tests/expected/locale.stdout

tests/locale.c