ci: add dual build artifacts to compare C vs Rust code paths (#2207)

* fix: flush pending EIT sections in EPG_free() before freeing buffers

* ci: add dual build artifacts to compare C vs Rust code paths

Add -min-rust flag to linux/build that passes -DDISABLE_RUST to gcc,
causing switchable modules (DTVCC, demuxer, AVC, networking, hex utils)
to use their C implementations instead of Rust. The Rust library still
compiles since many modules are Rust-only.

The Linux CI now produces two artifacts:
- "CCExtractor Linux build" — min Rust (C paths where available)
- "CCExtractor Linux build (with migrations)" — max Rust

Both should produce identical output on the sample platform. If they
diverge, it means a Rust port introduced a behavioral difference.

The sample platform will need a corresponding update to recognize and
test the new "with migrations" artifact.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Varadraj75 <agrawalvaradraj2007@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

linux/build

@@ -24,6 +24,11 @@ while [[ $# -gt 0 ]]; do
       BLD_LINKER="$BLD_LINKER -lswscale -lavutil -pthread -lavformat -lavcodec -lavfilter -lxcb-shm -lxcb -lX11 -llzma -lswresample"
       shift
       ;;
+    -min-rust)
+      MIN_RUST=true
+      BLD_FLAGS="$BLD_FLAGS -DDISABLE_RUST"
+      shift
+      ;;
     -system-libs)
       USE_SYSTEM_LIBS=true
       shift