Remove broken execvpe implementation

It was broken when enabled, and currently the libc definition is only
available for windows. This will be re-added when a new libc is released
that supports it across all available platforms

Cargo.toml

@@ -15,9 +15,6 @@ exclude     = [
   "test/**/*"
 ]
 
-[features]
-execvpe = []
-
 [dependencies]
 libc = "0.2.25"
 bitflags = "0.9"

src/unistd.rs

@@ -944,9 +944,6 @@ mod linux {
     use {Errno, Result, NixPath};
     use super::{Uid, Gid};
 
-    #[cfg(feature = "execvpe")]
-    use std::ffi::CString;
-
     pub fn pivot_root<P1: ?Sized + NixPath, P2: ?Sized + NixPath>(
             new_root: &P1, put_old: &P2) -> Result<()> {
         let res = try!(try!(new_root.with_nix_path(|new_root| {
@@ -991,23 +988,4 @@ mod linux {
 
         Errno::result(res).map(drop)
     }
-
-    #[inline]
-    #[cfg(feature = "execvpe")]
-    pub fn execvpe(filename: &CString, args: &[CString], env: &[CString]) -> Result<()> {
-        use std::ptr;
-        use libc::c_char;
-
-        let mut args_p: Vec<*const c_char> = args.iter().map(|s| s.as_ptr()).collect();
-        args_p.push(ptr::null());
-
-        let mut env_p: Vec<*const c_char> = env.iter().map(|s| s.as_ptr()).collect();
-        env_p.push(ptr::null());
-
-        unsafe {
-            super::ffi::execvpe(filename.as_ptr(), args_p.as_ptr(), env_p.as_ptr())
-        };
-
-        Err(Error::Sys(Errno::last()))
-    }
 }

test/test_unistd.rs

@@ -216,7 +216,3 @@ fn test_lseek64() {
 }
 
 execve_test_factory!(test_execve, execve, b"/bin/sh", b"/system/bin/sh");
-
-#[cfg(any(target_os = "linux", target_os = "android"))]
-#[cfg(feature = "execvpe")]
-execve_test_factory!(test_execvpe, execvpe, b"sh", b"sh");