_sysconfigdata.py: Introduce file

_sysconfigdata.py contains all the configuration data used by the interpreter at
runtime. This patch adds the slightly changed file generated by a ./configure
run.

Signed-off-by: Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
Signed-off-by: Costin Lupu <costin.lupu@cs.pub.ro>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

pyconfig.h: Disable features that are not avaiable on Unikraft

Some of these features have to enabled back when we will support them.

Signed-off-by: Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
Signed-off-by: Costin Lupu <costin.lupu@cs.pub.ro>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

pyconfig.h: Introduce file

pyconfig.h is generated when running ./configure and it contains the features
that are available on the build machine. This is copied from a local build.

Signed-off-by: Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
Signed-off-by: Costin Lupu <costin.lupu@cs.pub.ro>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

patches: Fix build issues

* Undefine HAVE_FORK and HAVE_EXECV
* Use pthread_t to unsigned long conversion

Signed-off-by: Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
Signed-off-by: Costin Lupu <costin.lupu@cs.pub.ro>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

Add Makefile.uk

In the original build, there are two kinds of sources: for core functionality
and for extensions. Each of them has a different set of compiler flags. In
order to emulate the same behavior, we define two libraries: 'python3-core' and
'python3-extensions'. Please notice that we still keep a 'python3' library as
the main logical library.

Signed-off-by: Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
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: Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
Signed-off-by: Costin Lupu <costin.lupu@cs.pub.ro>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

Initial commit (empty)

Signed-off-by: Costin Lupu <costin.lupu@cs.pub.ro>