findExecutable patch and additions

[Muhaimin Ahsan]

http://ghc.haskell.org/trac/ghc/ticket/2184#comment:13

I've provided a new implementation of findExecutable which actually checks for the executable bit on non-windows platforms.
In addition to that, there are also new functions implemented (see the #2184 comment 13).

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Muhaimin Ahsan
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