whisper-cpp: bump REF to QVAC-18991 upstream-sync HEAD (validation only)

[Zbig9000]

Summary

Validation-only PR. Single-purpose port-version bump so tetherto/qvac#TBD (QVAC-18991 validation bump of transcription-whispercpp) can run the addon CI against the QVAC-18991 upstream-sync content in isolation — no QVAC-18300 / 18992 / 18993 changes mixed in.

REF	tetherto/v1.8.4.2 → Zbig9000/47784b9e (whisper-cpp PR #25 HEAD)
version	1.8.4.2#1 → 1.8.4.3#0
Other changes	None — feature list / Android config / patches unchanged

Tasks

• QVAC-18991 — pull latest whisper.cpp from upstream. This PR exists to give the upstream-sync content a CI surface via the qvac monorepo's transcription-whispercpp on-PR workflow.

What this validates

Once the qvac-side validation PR (TBD link) is opened and the verified label is applied, its On PR Trigger (Whispercpp) workflow will exercise:

• sanity-checks — C++ static analysis on the rebuilt whisper-cpp source
• cpp-tests-coverage — the addon's native test suite linked against whisper-cpp 1.8.4.3#0
• cpp-lint
• run-integration-tests + run-mobile-integration-tests — end-to-end addon tests
• prebuild — the cross-platform prebuild matrix

If those go green, whisper-cpp PR #25 is proven safe to merge into tetherto/master — and after that lands + v1.8.4.3 is tagged, this PR can simply be closed (the production port version chain will arrive via vcpkg PR #152).

Notes for reviewer

• Do not merge this PR even if CI is green — it's a validation surface only. Closing without merging once the green run is recorded is the intended end-state.
• The 1.8.4.3#0 port-version it introduces sits between 1.8.4.2#1 (today's main) and the 1.8.4.3#1..#3 chain that PR whisper-cpp: bump to 1.8.4.3 with Android OpenCL + dynamic backends + MSVC fix (QVAC-18300, QVAC-18993) #152 builds toward. After PR QVAC-3975 version set 0.6.3 for addon cpp for other logger PR #25 + Version fix #27 + QVAC-4959: Updated qvac-lint-cpp to v1.3.0 #28 land on tetherto/master and PR whisper-cpp: bump to 1.8.4.3 with Android OpenCL + dynamic backends + MSVC fix (QVAC-18300, QVAC-18993) #152 re-points, the #0 slot belongs to whoever ships first; either way no functional collision.
• Source is byte-identical to tetherto/qvac-ext-lib-whisper.cpp PR QVAC-3975 version set 0.6.3 for addon cpp for other logger PR #25 HEAD 47784b9e (scripts/sync-ggml.last = 19eac6f0, the v0.10.2 upstream commit).

Cross-repo PR set

• whisper-cpp PR #25 — QVAC-18991 upstream sync (the thing being validated).
• whisper-cpp PR #27 — QVAC-18966 tts-cpp <atomic> fix (independent atomic fix, can merge in parallel).
• whisper-cpp PR #28 — QVAC-18993 bundled-ggml Android dynamic backend (the "rest" group, defer).
• ggml-speech PR #13 — QVAC-18992 (defer).
• vcpkg PR #152 — production speech-stack + Android dynamic backends (defer).
• qvac PR #2124 — production transcription-whispercpp 0.7.3 (defer).
• This PR — QVAC-18991 validation port, paired with qvac PR #TBD.

Made with Cursor

[GustavoA1604]

PR only used for validation of pulling from upstream in whisper-cpp. No need to merge it