add va_list overload of yajl_gen_config
#215
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This PR add va_list overload of
yajl_gen_config
.I am using this library from my JSON library in Swift.
Swift has C Interop feature so I use yajl API directly from Swift.
https://github.com/omochi/FineJSON/blob/master/Sources/FineJSON/JSONSerialize.swift
Unfortunately, Swift can not call variadic argument function in C.
This is limitation of interop feature.
But it can handle
va_list
normally.So I want to add this overload.