[PATCH] KConfig: Rewrite globals only if modified

[Chusslove Illich]

> [: David Faure :]
> Any chance for a unit test? :-P

Cannot reconcile the brevity with my view of reality :)

That is, what about the already present unit tests for KConfig? As it is,
they do sync configs and then read and compare stuff.

-- 
Chusslove Illich (Часлав Илић)
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