wxPython component require python static lib to be compiled with fPIC else
it raise this error:

ld: ${PYTHON_DIR}/lib/python2.7/config/libpython2.7.a(pythonrun.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC
...
collect2: error: ld returned 1 exit status

  This feature isn't used anymore. We support a two schema per software
type (at most):

    One for Software Instance
    One for Shared instance

Since theia 1.23.0 ( https://github.com/eclipse-theia/theia/pull/9820 ),
/file-upload is a simple HTTP endoint and no longer needs to be websocket.

Since 1.23.0 ( https://github.com/eclipse-theia/theia/pull/10514 ),
Theia uses socket.io and it needs /socket.io to support websocket,
otherwise it falls back to HTTP polling, which is significantly slower.

https://github.com/eclipse-theia/theia/releases/tag/v1.24.0

See merge request !1149

This version of scons only support python2

See merge request nexedi/slapos!1140

no need to prompt everytime. In the context of slapos theia, I guess we
can say that user trust the workspace

This is longer needed since years, also the part looks broken.

Reintroduce a patch to fix build error:

    execvp: printf: Argument list too long

that seems to happen again with nodejs 16.

Also add a note for minimal supported version, that will have to be
set in software

This partially reverts ee733f9d because
of issues with python3