Auto merge of #3526 - JohnTitor:rm-iconv-apple, r=JohnTitor

Remove inconv linking on apple

Closes #3097

Author: bors

libc-test/semver/apple.txt

@@ -1951,9 +1951,6 @@ getxattr
 glob
 glob_t
 globfree
-iconv
-iconv_close
-iconv_open
 iconv_t
 id_t
 idtype_t

src/unix/bsd/apple/mod.rs

@@ -6492,22 +6492,6 @@ cfg_if! {
     }
 }
 
-// These require a dependency on `libiconv`, and including this when built as
-// part of `std` means every Rust program gets it. Ideally we would have a link
-// modifier to only include these if they are used, but we do not.
-#[cfg_attr(not(feature = "rustc-dep-of-std"), link(name = "iconv"))]
-extern "C" {
-    pub fn iconv_open(tocode: *const ::c_char, fromcode: *const ::c_char) -> iconv_t;
-    pub fn iconv(
-        cd: iconv_t,
-        inbuf: *mut *mut ::c_char,
-        inbytesleft: *mut ::size_t,
-        outbuf: *mut *mut ::c_char,
-        outbytesleft: *mut ::size_t,
-    ) -> ::size_t;
-    pub fn iconv_close(cd: iconv_t) -> ::c_int;
-}
-
 cfg_if! {
     if #[cfg(target_pointer_width = "32")] {
         mod b32;