[Patch] Remove warnings regarding qualifier on function return type

[Morten Volden]

Hello

In order to start somewhere to get acquainted with the code in
kdevelop/kdeveplatform I decided to have a look at some of the warnings
generated by the code.

The attached patch removes a number of warnings from plugins/subversion
related to a superfluous const on function return type.

Regards

Morten
-- 
- When the split is pulled, mr. Grenade is no longer our friend
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