[PATCH/ARM] Enable Gold to set EF_ARM_HASENTRY attribute on ARM

[Yury Gribov]

Cary Coutant wrote:
> As Joseph said, this flag isn't defined by the ARM EABI, so I don't
> think we should bother with it.

Ok, makes sense. Should I close PR as WONTFIX?

> (Is there a reason other than
> consistency with Gnu ld that you filed the bug?)

Our local scripts use this flag to check validity of executable and they 
borked when we tried switching to Gold.
Now if this flag is unsupported, we'd probably rather fix our scripts.

-Y