Executable flagging patch

[Aaron Bentley]

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John A Meinel wrote:
> We might also want to have ChangeExecuteBit be aware of what rw bits are
> set. Because you may not want to enable X for a file which does not have
> rw for other.

Yeah.  I've never really been clear *which* execute bit we were talking
about.  Strictly speaking, we're talking about whether the file is
executible, and the use of x on directories is irrelevent.

I'd be happy either only changing the owner x bit, or obeying the umask.

Aaron
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