NVPTX: Use the embedded linker as default linker

Author: Kjetil Kjeka

Diff for: compiler/rustc_target/src/spec/nvptx64_nvidia_cuda.rs

@@ -10,9 +10,8 @@ pub fn target() -> Target {
         options: TargetOptions {
             os: "cuda".into(),
             vendor: "nvidia".into(),
-            linker_flavor: LinkerFlavor::Ptx,
-            // The linker can be installed from `crates.io`.
-            linker: Some("rust-ptx-linker".into()),
+            linker_flavor: LinkerFlavor::Embedded,
+            linker: Some("rust-embedded-linker".into()),
 
             // With `ptx-linker` approach, it can be later overridden via link flags.
             cpu: "sm_30".into(),