No fexecve() on DragonFly

This was not caught by libc-test, as checks for the execv functions
are disabled.

Author: mneumann

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

@@ -861,6 +861,9 @@ extern {
     pub fn msgsnd(msqid: ::c_int, msgp: *const ::c_void, msgsz: ::size_t,
         msgflg: ::c_int) -> ::c_int;
     pub fn cfmakesane(termios: *mut ::termios);
+    pub fn fexecve(fd: ::c_int, argv: *const *const ::c_char,
+                   envp: *const *const ::c_char)
+                   -> ::c_int;
 }
 
 cfg_if! {

src/unix/bsd/freebsdlike/mod.rs

@@ -1105,9 +1105,6 @@ extern {
                  timeout: *const ::timespec,
                  sigmask: *const sigset_t) -> ::c_int;
     pub fn settimeofday(tv: *const ::timeval, tz: *const ::timezone) -> ::c_int;
-    pub fn fexecve(fd: ::c_int, argv: *const *const ::c_char,
-                   envp: *const *const ::c_char)
-                   -> ::c_int;
 }
 
 cfg_if! {