suricata: fix rust+C MSAN build (google#9478)

Rust MSAN produces false positives when C clang version is not up to the
latest version.
See rust-lang/rust#107149

Will fix
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=55239&q=label%3AProj-suricata
and such

Should the fix be generic for other projects ?

projects/suricata/build.sh

@@ -25,6 +25,9 @@ then
     make -j$(nproc) all
     make -j$(nproc) install
     )
+    # Temporary workaround for https://github.com/rust-lang/rust/issues/107149
+    # until oss-fuzz clang is up to rustc clang (15.0.6).
+    export RUSTFLAGS="$RUSTFLAGS -Zsanitizer-memory-track-origins -Cllvm-args=-msan-eager-checks=0"
 fi
 
 (