message: Fix mini_core printf linking on windows
  Link against legacy_stdio_definitions on windows which provides printf as a linkable symbol.
diff: @@ -575,11 +575,19 @@ pub mod intrinsics {
  }
  pub mod libc {
  + // With the new Universal CRT, msvc has switched to all the printf functions being inline wrapper
  + // functions. legacy_stdio_definitions.lib which provides the printf wrapper functions as normal
  + // symbols to link against.
  + #[cfg_attr(unix, link(name = "c"))]
  + #[cfg_attr(target_env="msvc", link(name="legacy_stdio_definitions"))]
  + extern "C" {
  + pub fn printf(format: *const i8, ...) -> i32;
  + }
  +
  #[cfg_attr(unix, link(name = "c"))]
  #[cfg_attr(target_env = "msvc", link(name = "msvcrt"))]
  extern "C" {
  pub fn puts(s: *const i8) -> i32;
  - pub fn printf(format: *const i8, ...) -> i32;
  pub fn malloc(size: usize) -> *mut u8;
  pub fn free(ptr: *mut u8);
  pub fn memcpy(dst: *mut u8, src: *const u8, size: usize);
  