execvpe should handle ENOTDIR

If PATH environment variable contains non directory component, execvpe fails by ENOTDIR.

For example, if "/tmp/foo" is a regular file, the following program fails with PATH contains "/tmp/foo".

module Main where

import System.Environment
import System.Posix.Process

main :: IO ()
main = do
    env <- getEnvironment
    executeFile "echo" True [] (Just env)
    return ()

$ PATH=/tmp/foo:$PATH runghc a.hs   
a.hs: echo: executeFile: inappropriate type (Not a directory)

See for example, https://github.com/haskell/cabal/issues/1723

Trac metadata

Trac field	Value
Version	7.8.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries/unix
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