Don't link legacy_stdio_definitions from std

std on Windows does not use `printf` or `fprintf` so never needs the `legacy_stdio_definitions.lib` import library.

src/windows/mod.rs

@@ -278,6 +278,7 @@ impl ::Clone for fpos_t {
 }
 
 // Special handling for all print and scan type functions because of https://github.com/rust-lang/libc/issues/2860
+#[cfg(not(feature = "rustc-dep-of-std"))]
 #[cfg_attr(
     all(windows, target_env = "msvc"),
     link(name = "legacy_stdio_definitions")