Setting up indirect access to external data for loongarch64-linux-{musl,ohos}

In issue #118053, the `loongarch64-unknown-linux-gnu` target needs indirection
to access external data, and so do the `loongarch64-unknown-linux-musl` and
`loongarch64-unknown-linux-ohos` targets.

Author: heiher

compiler/rustc_target/src/spec/targets/loongarch64_unknown_linux_musl.rs

@@ -19,6 +19,7 @@ pub(crate) fn target() -> Target {
             llvm_abiname: "lp64d".into(),
             max_atomic_width: Some(64),
             crt_static_default: false,
+            direct_access_external_data: Some(false),
             ..base::linux_musl::opts()
         },
     }

compiler/rustc_target/src/spec/targets/loongarch64_unknown_linux_ohos.rs

@@ -17,6 +17,7 @@ pub(crate) fn target() -> Target {
             features: "+f,+d".into(),
             llvm_abiname: "lp64d".into(),
             max_atomic_width: Some(64),
+            direct_access_external_data: Some(false),
             ..base::linux_ohos::opts()
         },
     }