Merge pull request #3679 from rust-lang/revert-3670-wasi-getpid

Revert "Add getpid in wasi"

Author: JohnTitor

src/wasi.rs

@@ -730,8 +730,6 @@ extern "C" {
     pub fn getcwd(buf: *mut c_char, size: ::size_t) -> *mut c_char;
     pub fn chdir(dir: *const c_char) -> ::c_int;
 
-    pub fn getpid() -> pid_t;
-
     pub fn nl_langinfo(item: ::nl_item) -> *mut ::c_char;
     pub fn nl_langinfo_l(item: ::nl_item, loc: ::locale_t) -> *mut ::c_char;