nitcc: add a Makefile

Signed-off-by: Jean Privat <jean@pryen.org>
nitcc: add minilang in Makefile

Signed-off-by: Jean Privat <jean@pryen.org>
nitcc: update .gitignore

Signed-off-by: Jean Privat <jean@pryen.org>
nitcc: add README
nitcc: move nitcc_runtime to lib/

The point of the runtime library is to be accessible by programs.

Signed-off-by: Jean Privat <jean@pryen.org>
nitcc: remove superfluous -I in Makefile and t

Because nitcc_runtime is in lib/

Signed-off-by: Jean Privat <jean@pryen.org>