Add ogg metadata writing (stub) #319

Job	Run time
build (32-bit-words, --disable-64-bit-words)	54s
build (integer-only-library, -DFLAC__INTEGER_ONLY_LIBRARY)	55s
build (no-asm, --disable-asm-optimizations)	1m 8s
build (no-ogg, --disable-ogg)	1m 9s
	4m 6s

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