Fix missing dependencies in flake for make

[ekzyis]

Important

26.04 FREEZE March 11th: Non-bugfix PRs not ready by this date will wait for 26.06.

RC1 is scheduled on March 23rd

The final release is scheduled for April 15th.

I followed the developer guide. On 13608c5, I get the following error after running nix develop, ./configure and then make:

tests/fuzz/fuzz-hmac-sha256.c:8:10: fatal error: openssl/evp.h: No such file or directory

After adding openssl, without protobuf, make fails while building cln-grpc v0.5.0 because the protoc binary is missing:

error: failed to run custom build command for `cln-grpc v0.5.0 (/home/ekzyis/prog/c-lightning/cln-grpc)`

Caused by:
  process didn't exit successfully: `/home/ekzyis/prog/c-lightning/target/debug/build/cln-grpc-cafbb5a40c9ead3e/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-changed=proto/node.proto
  cargo:rerun-if-changed=proto

  --- stderr

  thread 'main' (219469) panicked at cln-grpc/build.rs:7:10:
  called `Result::unwrap()` on an `Err` value: Custom { kind: NotFound, error: "Could not find `protoc`. If `protoc` is installed, try setting the `PROTOC` environment variable to the path of the `protoc` binary. To install it on Debian, run `apt-get install protobuf-compiler`. It is also available at https://github.com/protocolbuffers/protobuf/releases  For more information: https://docs.rs/prost-build/#sourcing-protoc" }

This PR fixes this by adding the missing dependencies to the flake.

Checklist

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• The changelog has been updated in the relevant commit(s) according to the guidelines.
• Tests have been added or modified to reflect the changes.
• Documentation has been reviewed and updated as needed.
• Related issues have been listed and linked, including any that this PR closes.
• Important All PRs must consider how to reverse any persistent changes for tools/lightning-downgrade

Changelog-None

[ekzyis]

I think the CI errors are unrelated:

ccan/tools/configurator/configurator: Test for HAVE_BIG_ENDIAN did not compile:
ld: warning: reexported library with install name '/opt/homebrew/opt/llvm@15/lib/libunwind.1.dylib' found at '/opt/homebrew/Cellar/llvm@15/15.0.7/lib/libunwind.1.0.dylib' couldn't be matched with any parent library and will be linked directly

FAILED tests/test_plugin.py::test_channel_state_changed_unilateral - TimeoutError: Unable to find "[re.compile('Server started with public key')]" in logs.