message: Fix metabuild::metabuild_build_plan
diff: @@ -433,6 +433,7 @@ fn metabuild_build_plan() {
  "package_name": "mb",
  "package_version": "0.5.0",
  "target_kind": ["lib"],
  + "compile_mode": "build",
  "kind": "Host",
  "deps": [],
  "outputs": ["[..]/target/debug/deps/libmb-[..].rlib"],
  @@ -446,6 +447,7 @@ fn metabuild_build_plan() {
  "package_name": "mb-other",
  "package_version": "0.0.1",
  "target_kind": ["lib"],
  + "compile_mode": "build",
  "kind": "Host",
  "deps": [],
  "outputs": ["[..]/target/debug/deps/libmb_other-[..].rlib"],
  @@ -459,6 +461,7 @@ fn metabuild_build_plan() {
  "package_name": "foo",
  "package_version": "0.0.1",
  "target_kind": ["custom-build"],
  + "compile_mode": "build",
  "kind": "Host",
  "deps": [0, 1],
  "outputs": ["[..]/target/debug/build/foo-[..]/metabuild_foo-[..][EXE]"],
  @@ -472,6 +475,7 @@ fn metabuild_build_plan() {
  "package_name": "foo",
  "package_version": "0.0.1",
  "target_kind": ["custom-build"],
  + "compile_mode": "run-custom-build",
  "kind": "Host",
  "deps": [2],
  "outputs": [],
  @@ -485,6 +489,7 @@ fn metabuild_build_plan() {
  "package_name": "foo",
  "package_version": "0.0.1",
  "target_kind": ["lib"],
  + "compile_mode": "build",
  "kind": "Host",
  "deps": [3],
  "outputs": ["[..]/foo/target/debug/deps/libfoo-[..].rlib"],
  