tools: copy hdr_histogram_internal.h in update-histogram.sh

[fcostaoliveira]

tools/dep_updaters/update-histogram.sh copies a fixed list of files from the HdrHistogram_c release into deps/histogram.

HdrHistogram_c 0.12.0 (released 2026-10-02, https://github.com/HdrHistogram/HdrHistogram_c/releases/tag/0.12.0) made src/hdr_tests.h include a new private header, src/hdr_histogram_internal.h, and that header is not on the list.

As a result the automated update, #66494, fails to build in CI:

deps/histogram/src/hdr_tests.h:12:10: fatal error:
'hdr_histogram_internal.h' file not found

This adds the header to the cp line. Nothing else changes: histogram.gyp, BUILD.gn and unofficial.gni list only src/hdr_histogram.c and the public header, and the other files 0.12.0 needs (hdr_atomic.h, hdr_malloc.h, hdr_tests.h) are already copied.

The 0.12.0 update itself is not part of this PR; it is #66494, which still needs the header file added (see my comment there).

How I checked it:

• Resolved the project-local #includes of src/hdr_histogram.c at the 0.12.0 tag, transitively: it needs hdr_histogram.h, hdr_atomic.h, hdr_tests.h, hdr_histogram_internal.h and itself. Before this change only hdr_histogram_internal.h is missing from the copy list.
• All five failing jobs of deps: update histogram to 0.12.0 #66494 (Linux x64 and arm64, macOS, the tarball build and Windows coverage) fail with exactly this error and no other.
• Ran tools/dep_updaters/update-histogram.sh in a checkout of main (c56cb094), which fetched 0.12.0: deps/histogram/src/hdr_histogram_internal.h appears as a new file with this change. Syntax-checked with cc -fsyntax-only -Ideps/histogram/src -Ideps/histogram/include deps/histogram/src/hdr_histogram.c, which succeeds. I did not run a full Node build. I then discarded the update, so this PR contains only the one-line script change.

AI use disclosure: I used an AI coding assistant (Claude Code) to analyse the updater script against the 0.12.0 tag and to draft this one-line patch and this description. I reviewed the change and the include analysis myself and I will answer review comments myself. I am a maintainer of HdrHistogram_c.

[nodejs-github-bot]

Review requested:

• @nodejs/security-wg

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