ffmpeg-v4l2-request-fourier: route H.264 luma-h deblock through daedalus-fourier (0008)

Adds patch 0008 to the substitution arc, mirroring 0005's V variant
for H.264 non-intra bS<4 horizontal luma deblock.

  H264DSPContext.h_loop_filter_luma →
    daedalus_recipe_dispatch_h264_deblock_luma_h

The H kernel was added to daedalus-fourier in PR #9 (vendored
ff_h264_h_loop_filter_luma_neon, wired through the same CPU-dispatch
pattern as V).  Recipe table routes AUTO to CPU NEON (no QPU shader
for H yet), so this is a NEON-to-NEON substitution via the daedalus
recipe layer — same shape as 0005.

The libavcodec.so ctx remains no-QPU (daedalus_ctx_create_no_qpu),
matching the existing 0003/0004/0005/0007 patches.  Higher-cycle
QPU init waits for a feature-flag gating change in a separate PR.

Intra (bS=4) h_loop_filter_luma_intra stays on the in-tree NEON .S
code; daedalus_h264_deblock_meta covers the non-intra path only.
A follow-up can route intra once daedalus-fourier exposes the
intra-h dispatch (the kernel already exists internally per fourier
PR #11).

Wires the new patch into both arch/PKGBUILD and debian/build-deb.sh
sequences.  Verified the patch applies cleanly on top of 0001-0007
against the pinned upstream commit b57fbbe5 on hertz.

debian/ffmpeg-v4l2-request-fourier/build-deb.sh

@@ -74,6 +74,7 @@ patch -Np1 -i "$HERE/0004-h264-idct8-daedalus-fourier.patch"
 patch -Np1 -i "$HERE/0005-h264-deblock-luma-v-daedalus-fourier.patch"
 patch -Np1 -i "$HERE/0006-h264-restore-low-delay.patch"
 patch -Np1 -i "$HERE/0007-h264-qpel-mc20-daedalus-fourier.patch"
+patch -Np1 -i "$HERE/0008-h264-deblock-luma-h-daedalus-fourier.patch"
 
 # --- daedalus-fourier: fetch + build static .a with PIC, install to a
 # per-build prefix; libavcodec.so links it into the shared object so