[Patch xserver] (percent) option parsing fixes

[Simon Thum]

The attached patches allow to not just parse, but use percent options as
double. It seems this has been the intent, as only one function was
returning int. This makes sense mainly to adjust the newly-added
synaptics noise cancellation in the low percent range.

Next, don't emit warnings when not marking as used. This lets drivers
check option syntax more flexibly without scaring users.

Cheers,

Simon

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