Remove the freebsd specific adjtime.

Author: guyru

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -4204,7 +4204,6 @@ extern "C" {
     pub fn getpagesize() -> ::c_int;
     pub fn getpagesizes(pagesize: *mut ::size_t, nelem: ::c_int) -> ::c_int;
 
-    pub fn adjtime(arg1: *const ::timeval, arg2: *mut ::timeval) -> ::c_int;
     pub fn clock_getcpuclockid2(arg1: ::id_t, arg2: ::c_int, arg3: *mut clockid_t) -> ::c_int;
 
     pub fn shm_create_largepage(