[cp-patches] nio charset provider

[Sven de Marothy]

Hi,
Here's an addendum to my last patch.

The extra charsets in the NIO provider aren't loaded on initialization,
but rather when the program either requests a list of all available
charsets or when the request for a charset fails when all of them aren't
loaded.

This saves up to 20 milliseconds off the bootstrap time, which will make
a big difference for most popular apps like Eclipse.

/Sven

provider.patch
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