kconfig/conf: mark xfgets() private
This function has not much reason to be public. In the mean time, convert
declaration from K&R C to ISO C.
Signed-off-by: 
Arnaud Lacombe <lacombar@gmail.com>
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This function has not much reason to be public. In the mean time, convert
declaration from K&R C to ISO C.
Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>