[win] Ignore MSVC linker warning 4217

Author: dpaoliello

compiler/rustc_target/src/spec/base/msvc.rs

@@ -16,6 +16,9 @@ pub(crate) fn opts() -> TargetOptions {
             // is generated by the compiler, but marked as a foreign item (hence the dllimport) in
             // the standard library.
             "/IGNORE:4286",
+            // "Symbol was defined in one obj, but imported by another"
+            // Same issue and root cause as 4286.
+            "/IGNORE:4217",
         ],
     );