Also check rust.default-linker

Author: Kobzol

src/bootstrap/src/core/config/config.rs

@@ -863,7 +863,9 @@ impl Config {
 
                 let mut target = Target::from_triple(&triple);
 
-                if target_default_linker.is_some() && target_default_linker_linux.is_some() {
+                if (target_default_linker.is_some() || rust_default_linker.is_some())
+                    && target_default_linker_linux.is_some()
+                {
                     panic!(
                         "cannot set both `default-linker` and `default-linker-linux` for target {triple}"
                     );