base+base-initfs: integrate CachyOS analysis improvements

Updates the local/sources/base submodule pointer to pick up the
PIIX4 IDE BAR quirk + vgaarb logging + archiso loop_mnt, and
updates the base-initfs recipe to cross-compile loop_mnt before
the redox-initfs-ar archive step.

See local/sources/base commit 2055dcd for the individual
changes.

recipes/core/base-initfs/recipe.toml

@@ -124,6 +124,17 @@ else
     cp -v "${COOKBOOK_BUILD}/${TARGET}/release/bootstrap" "${COOKBOOK_BUILD}/bootstrap"
 fi
 
+# Build the loop_mnt discovery helper as a separate target so the
+# initfs can fall back to scanning for the live medium at runtime
+# (analogous to CachyOS's archiso_loop_mnt hook). Cross-compile
+# directly so we don't need a runtime libstd.
+CARGO_PROFILE_RELEASE_OPT_LEVEL=s CARGO_PROFILE_RELEASE_PANIC=abort \
+"${COOKBOOK_CARGO}" build ${build_flags} \
+    --manifest-path "${COOKBOOK_SOURCE}/initfs/tools/Cargo.toml" \
+    --target "${TARGET}" \
+    --bin loop_mnt
+cp -v "target/${TARGET}/${build_type}/loop_mnt" "${COOKBOOK_BUILD}/initfs/bin/loop_mnt"
+
 env -u CARGO -u RUSTFLAGS cargo run --manifest-path "${COOKBOOK_SOURCE}/initfs/tools/Cargo.toml" --bin redox-initfs-ar -- "${COOKBOOK_BUILD}/initfs" "${COOKBOOK_BUILD}/bootstrap" -o "${COOKBOOK_BUILD}/initfs.img"
 
 mkdir -pv "${COOKBOOK_STAGE}/usr/lib/boot"