linker: Use --as-needed by default when linker supports it

compiler/rustc_target/src/spec/vxworks_base.rs

@@ -1,21 +1,6 @@
-use crate::spec::{LinkArgs, LinkerFlavor, TargetOptions};
+use crate::spec::TargetOptions;
 
 pub fn opts() -> TargetOptions {
-    let mut args = LinkArgs::new();
-    args.insert(
-        LinkerFlavor::Gcc,
-        vec![
-            // We want to be able to strip as much executable code as possible
-            // from the linker command line, and this flag indicates to the
-            // linker that it can avoid linking in dynamic libraries that don't
-            // actually satisfy any symbols up to that point (as with many other
-            // resolutions the linker does). This option only applies to all
-            // following libraries so we're sure to pass it as one of the first
-            // arguments.
-            "-Wl,--as-needed".to_string(),
-        ],
-    );
-
     TargetOptions {
         os: "vxworks".to_string(),
         env: "gnu".to_string(),
@@ -27,7 +12,6 @@ pub fn opts() -> TargetOptions {
         os_family: Some("unix".to_string()),
         linker_is_gnu: true,
         has_rpath: true,
-        pre_link_args: args,
         position_independent_executables: false,
         has_elf_tls: true,
         crt_static_default: true,