chore: add header

---
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
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  - task: lint_javascript_cli
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  - task: lint_javascript_tests
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  - task: lint_python
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  - task: lint_c_src
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  - task: lint_c_benchmarks
    status: missing_dependencies
  - task: lint_c_tests_fixtures
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  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
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  - task: lint_license_headers
    status: passed
---

Author: DivitJain26

lib/node_modules/@stdlib/blas/base/cgemv/benchmark/c/benchmark.length.c

@@ -17,6 +17,7 @@
 */
 
 #include "stdlib/blas/base/cgemv.h"
+#include "stdlib/blas/base/shared.h"
 #include <stdlib.h>
 #include <stdio.h>
 #include <math.h>