Reverts 15871bbf

When using slapos.reboostrap to re-launch buildout with the version
of Python that was just installed, zc.buildout and its dependencies
are reinstalled for the new Python with the same egg versions. Thus
SRs which install Python 2 need to use Python-2-compatible versions
of setuptools, pip and wheel all along.

For this stack/slapos-py2.cfg is introduced.

It is also used to move all

```
[openssl]
<= openssl-1.1
```

from individual Python2 SRs to a common place.

Except for python2: keep beautifulsoup4=4.8.2.

beautifulsoup4=4.12.2 requires flit as build backend.

backcall=0.2.0 requires flit-core as build backend

entrypoints=0.3 rquires flit as build backend

pkgconfig=1.5.1 requires poetry as build backend.

Earlier version 1.22.0 does not support recent setuptools.

Latest version 1.26.2 has more complex build requirements,
left for later.

Now that buildout uses pip to correctly follow pyproject.toml,
cattrs=22.2.0 requires poetry as the build backend.

For now it's easier to install as wheel than to install poetry and
then use it as setup-egg for cattrs. This must be done eventually.

zc.buildout=2.7.1+slapos020 is SlapOS-patched buildout2 with support
for bootstrapping buildout3, required to be able to install buildout3.

Downgrade related eggs to pre-buildout3 versions as well.

Version up zc.buildout, pip and zc.recipe.egg.

Version up slapos.rebootstrap to adapt to buildout3.

Some phones with Android 12+ disconnects from
5G networks which don't support IMS. Therefore
we add minimal IMS support in this commit (even
though we don't actually need it's features).

Only Amarisoft >= 2024-05-02 support launching
lteims without root privilege, so if Amarisoft
version is older IMS is disabled and we inform
the user so in the connection parameters.

For this to work, SIM cards config needs to be
modified, impu and impi must be for instance:
impu: 001010000001312,
impi: 001010000001312@ims.mnc001.mcc001.3gppnetwork.org

 - pycrypto does not seem used (because it does not work on py3 with buildout3)
 - cns.recipe.symlink and PyRSS2Gen versions are defined in stack/slapos.cfg

See merge request !1587

Revert eb1b1a41 to avoid the use of
`fPIC` flag as it is a "contagious" build option.

To not face the build error "relocation R_X86_64_32 against
.rodata.str1.8 can not be used when making a shared object; recompile
with -fPIC" while building a shared library without fPIC flag, `gcc` is
compiled with `-enable-default-pie` flag (which is a compilation option
used for `gcc` binaries provided by Debian by example, see `gcc -v`).

Since slapos package provides gettext, it is not necessary to build
gettext here. Also slapos package's gettext commands such as msgfmt
may not work with libraries built by a software release, thus remove
LD_LIBRARY_PATH.