Add rules for building runtime Go packages

The file packages.uk file was generated by capturing the building
commands from the output of the original libgo build. This patch also
adds the generated .go files needed for building the packages.

Signed-off-by: Costin Lupu <costin.lupu@cs.pub.ro>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

Add Makefile.uk

This patch also adds the generated config.h and runtime.inc headers.

Signed-off-by: Charalampos Mainas <Charalampos.Mainas@neclab.eu>
Signed-off-by: Costin Lupu <costin.lupu@cs.pub.ro>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

Introduce library skeleton

We use the BSD-3-Clause license for this library glue code.

Signed-off-by: Charalampos Mainas <Charalampos.Mainas@neclab.eu>
Signed-off-by: Costin Lupu <costin.lupu@cs.pub.ro>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

Initial commit (empty)