Run the Mach-O CI on mold's packages

The Mach-O shell tests are now the mold package's macho-integration
test. The executable is built with the Mach-O targets alone, and only
the Mach-O crates' unit tests run on the macOS runner.

.github/workflows/macho.yml

@@ -38,9 +38,12 @@ jobs:
       # default timeout, as mold's CI gives its slow configurations more:
       # here the simulator's tests are slow, lldb's above all, whose lldb
       # session alone takes ten seconds on a Mac, and the first of which
-      # ran past a minute on the hosted runners.
-      - run: cargo test --workspace --lib --bins
-      - run: cargo test -p mold-macho-cli --test integration -- --timeout 120
+      # ran past a minute on the hosted runners. The executable is built
+      # without the ELF targets, which these tests don't use.
+      - run: cargo test --locked -p mold-macho -p mold-macho-tests --lib
+      - run: |
+          cargo test --locked -p mold --no-default-features --features macho-arm64,macho-x86_64 \
+            --test macho-integration -- --timeout 120
 
       # The harness reports only which tests failed; each test's log
       # and its output directory are kept under the target directory.