Remove FD_SET and related functions for now.

Author: sunfishcode

src/wasi.rs

@@ -1060,11 +1060,6 @@ extern {
     ) -> ::locale_t;
     pub fn uselocale(loc: ::locale_t) -> ::locale_t;
 
-    pub fn FD_CLR(fd: ::c_int, set: *mut fd_set) -> ();
-    pub fn FD_ISSET(fd: ::c_int, set: *const fd_set) -> bool;
-    pub fn FD_SET(fd: ::c_int, set: *mut fd_set) -> ();
-    pub fn FD_ZERO(set: *mut fd_set) -> ();
-
     pub fn __wasilibc_register_preopened_fd(
         fd: c_int,
         path: *const c_char,