edgetx: 2.7.2 -> 2.11.0-rc3, expand build for all targets

Previously the companion was built only for a single default target.
This is very unexpected. Upstream build system is a huge pain, so
our build will also look very hacky. For reference [1] is how upstream
builds their repo. I've tried to make the derivation not very cringeworthy,
but there's a lot of complexity piled on.

Some specific problems to keep an eye out for:

- All targets have to be enumerated by hand. I've put it into a separate
  file to improve readability.
- libclang shenanigans. Upstream uses python bindings for `libclang` to
  generate code at compile time. To make it find C/C++ standard library
  headers we have to patch the scripts and read nix-support/{libc,libcxx}-cflags
  to extract the necessary compiler flags that cc-wrapper usually handles for us.

[1]: https://github.com/EdgeTX/edgetx/blob/v2.11.0-rc3/tools/build-companion.sh

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