rustc: Stricter checking for #[link] attributes

compiler/rustc_error_codes/src/error_codes/E0455.md

@@ -1,6 +1,11 @@
+Some linking kinds are target-specific and not supported on all platforms.
+
 Linking with `kind=framework` is only supported when targeting macOS,
 as frameworks are specific to that operating system.
 
+Similarly, `kind=raw-dylib` is only supported when targeting Windows-like
+platforms.
+
 Erroneous code example:
 
 ```ignore (should-compile_fail-but-cannot-doctest-conditionally-without-macos)

compiler/rustc_error_codes/src/error_codes/E0458.md

@@ -12,3 +12,4 @@ Please specify a valid "kind" value, from one of the following:
 * static
 * dylib
 * framework
+* raw-dylib