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Merge bitcoin/bitcoin#33902: doc: Document compiler configuration for native depends packages

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4c07cf87e2288d4a8b0174ad64e52f455de9029e doc: document depends compiler configuration (will)

Pull request description:

  Fixes: #33859

  Previously one had to read the Makefile (and various *.mk configuration
  files) to see how to correctly override CC and CXX when building native
  depends packages.

  Detail this in README.md to make it clearer.

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depends/README.md
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@ -108,6 +108,18 @@ The following can be set when running make: `make FOO=bar`
If some packages are not built, for example `make NO_WALLET=1`, the appropriate CMake cache
variables will be set when generating the Bitcoin Core buildsystem. In this case, `-DENABLE_WALLET=OFF`.
## Compiler Configuration
`CC` and `CXX` control target compilers. `build_CC` and `build_CXX` control
compilers for native build tools (e.g. `native_capnp`, `native_qt`), which
default to `gcc`/`g++` on Linux and `clang`/`clang++` on macOS/FreeBSD/OpenBSD
(see `./depends/builders/*.mk`).
On a system where the default build compiler is not available (e.g. Linux
without gcc/g++), you could use the following to build all packages using clang:
make -C depends build_CC=clang build_CXX=clang++ CC=clang CXX=clang++
## Cross compilation
To build for another arch/OS: