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doc: document depends compiler configuration

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CC/CXX only override compilers for target (host) packages. Native
build tool packages (native_capnp, native_qt, etc.) use separate
build_CC/build_CXX variables, which default to gcc/g++ on Linux.

On systems without gcc (e.g. Nix, Chimera Linux), native package
builds fail unless build_CC/build_CXX are also set explicitly.
Document how to override both sets of compilers.
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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: