build: run C benchmarks in sub-directories

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: na
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: passed
  - task: lint_typescript_declarations
    status: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

---
type: pre_push_report
description: Results of running various checks prior to pushing changes.
report:
  - task: run_javascript_examples
    status: na
  - task: run_c_examples
    status: na
  - task: run_cpp_examples
    status: na
  - task: run_javascript_readme_examples
    status: na
  - task: run_c_benchmarks
    status: na
  - task: run_cpp_benchmarks
    status: na
  - task: run_fortran_benchmarks
    status: na
  - task: run_javascript_benchmarks
    status: na
  - task: run_julia_benchmarks
    status: na
  - task: run_python_benchmarks
    status: na
  - task: run_r_benchmarks
    status: na
  - task: run_javascript_tests
    status: na
---

Author: Planeshifter

Diff for: .github/workflows/scripts/run_affected_benchmarks

@@ -143,7 +143,7 @@ main() {
 
 	# Run C benchmarks:
 	echo "Finding C benchmark files in ${directories}..."
-	c_bench_files=$(find "${directories}" -maxdepth 4 -wholename '**/benchmark/c/benchmark*.c' -exec realpath {} \; | grep -v '/fixtures/' | sort -u | tr '\n' ' ') || true
+	c_bench_files=$(find "${directories}" -maxdepth 5 \( -wholename '**/benchmark/c/benchmark*.c' -or -wholename '**/benchmark/c/**/benchmark*.c' \) -exec realpath {} \; | grep -v '/fixtures/' | sort -u | tr '\n' ' ') || true
 
 	if [ -n "${c_bench_files}" ]; then
 		make benchmark-c-files FILES="${c_bench_files}"