Makefile.uk: Skip building types.c and closures.c with Python3

Python3 comes with its own types and closures when enabling the _ctypes
extension. We currently check if the extension is enabled, but a more
generic symbol should be defined at some point.

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

Remove the exportsyms.uk file.

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

Adding extra information

Add external library depedencies and known bug notice.

Signed-off-by: Charalampos Mainas <Charalampos.Mainas@neclab.eu>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

Port libffi library

This port also adds generated ffi.h and fficonfig.h 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>

Port libbacktrace library

This port also adds generated config.h and backtrace-supported.h
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>

Add Makefile.uk

GCC is a suite of multiple libraries. In this patch we introduce only
the basic contents for the Makefile.

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)