[sr-dev] [kamailio/kamailio] app_python3: update Python3 detection mechanism (#2282)

[micmac1]

This commit

  - removes the python calls whose output is never actually used.

  - changes the include discovery to use python3(.x)-config. This is
    preferable because it also works for cross-compiling. Calling
    python3(.x) directly will always provide host flags, which for
    cross-compiling is not feasible.

  - updates LDFLAGS discovery to also work with >= Python 3.8. To
    achieve this python3(.x)-config is first run with the argument
    "--embed". If this does not succeed (exit status 1)
    python3(.x)-config is run again without "--embed". This is the
    method suggested by Python upstream to provide backwards
    compatibility. See [1] for more details.

[1] https://docs.python.org/3/whatsnew/3.8.html

Signed-off-by: Sebastian Kemper <sebastian_ml at gmx.net>

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#### Description
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Hi all,

While trying to get app_python3 going on OpenWrt I stumbled over this. We're cross-compiling and I got the wrong includes (host includes instead of target includes).

And then there was also the "-lpython3.x" missing because we're using python 3.8 which doesn't provide this linker flags by default anymore. So once I tried to load the module on the target device it threw an error:

```
Fri Apr 10 18:52:13 2020 daemon.err kamailio[15622]:  0(15622) ERROR: <core> [core/sr_module.c:512]: load_module(): could not open module </usr/lib/kamailio/modules/app_python3.so>: Error relocating /usr/lib/kamailio/modules/app_python3.so: PyTuple_New: symbol not found
Fri Apr 10 18:52:13 2020 daemon.err kamailio[15622]:  0(15622) CRITICAL: <core> [core/cfg.y:3543]: yyerror_at(): parse error in config file /etc/kamailio/kamailio.cfg, line 124, column 12-27: failed to load module
```

This pull requested fixes this.

Kind regards,
Seb
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2282

-- Commit Summary --

  * app_python3: update Python3 detection mechanism

-- File Changes --

    M src/modules/app_python3/Makefile (12)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2282.patch
https://github.com/kamailio/kamailio/pull/2282.diff

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