CamelDataCache: Use GFileIOStream.
CamelDataCache: Use GFileIOStream.

Return pure CamelStreams with an underlying GFileIOStream,
instead of CamelStreamFs.

matzipan/evolution-data-server,tintou/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server