Auto merge of #670 - Susurrus:execvpe, r=alexcrichton

Add execvpe for support *nix platforms

Author: bors

src/unix/bsd/netbsdlike/openbsdlike/openbsd.rs

@@ -30,4 +30,6 @@ s! {
 extern {
     pub fn accept4(s: ::c_int, addr: *mut ::sockaddr,
                    addrlen: *mut ::socklen_t, flags: ::c_int) -> ::c_int;
+    pub fn execvpe(file: *const ::c_char, argv: *const *const ::c_char,
+                   envp: *const *const ::c_char) -> ::c_int;
 }

src/unix/haiku/mod.rs

@@ -855,6 +855,8 @@ extern {
                    flags: ::c_int) -> ::ssize_t;
     pub fn recvmsg(fd: ::c_int, msg: *mut ::msghdr, flags: ::c_int)
                    -> ::ssize_t;
+    pub fn execvpe(file: *const ::c_char, argv: *const *const ::c_char,
+                   environment: *const *const ::c_char) -> ::c_int;
 }
 
 cfg_if! {

src/unix/notbsd/mod.rs

@@ -1036,6 +1036,8 @@ extern {
                 name: *mut ::c_char,
                 termp: *const termios,
                 winp: *const ::winsize) -> ::pid_t;
+    pub fn execvpe(file: *const ::c_char, argv: *const *const ::c_char,
+                   envp: *const *const ::c_char) -> ::c_int;
 }
 
 cfg_if! {