[RFC] Add contrib/fix-ChangeLog.sh

[Tom de Vries]

Hi,

this patch adds a script contrib/fix-ChangeLog.sh.

It fixes whitespace issues, and shows ChangeLog lines that look suspicious.

Using the script, I was able to find a stray changelog entry (removed in 
rr233583, https://gcc.gnu.org/viewcvs?rev=233583&root=gcc&view=rev ).

And I've

Any comments?

Thanks,
- Tom
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