coreos: Add coreos-cargo hook for sys-block/thin-provisioning-tools

We currently ship an amd64 binary of thin-provisioning-tools on arm64.
To fix this add a hook that hijacks src_unpack and calls the
cross-compilation friendly implementation. We also need to fixup the
src_install implementation since it looks for the produced binary in the
default cargo location.

Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>

sdk_container/src/third_party/coreos-overlay/coreos/config/env/sys-block/thin-provisioning-tools

@@ -0,0 +1,16 @@
+cros_pre_src_unpack_coreos_unpack() {
+  local _COREOS_CARGO_SKIP_INHERIT=1
+  source "${CROS_ADDONS_TREE}"/../eclass/coreos-cargo.eclass
+  src_unpack() {
+    einfo "Running coreos-cargo_src_unpack"
+    coreos-cargo_src_unpack
+  }
+}
+
+cros_pre_src_install_rust_cross() {
+  pushd "${S}"
+  local rust_target="$(ls -d target/*-unknown-linux-gnu)"
+  rust_target="${rust_target#target/}"
+  ln -f target/{"${rust_target}",}/"$(usex debug debug release)/pdata_tools" || die
+  popd
+}