Update flac.md : fix -q, some reshuffling, minor rephrasing. #26

Job	Run time
build (32-bit-words, --disable-64-bit-words)	3m 12s
build (integer-only-library, -DFLAC__INTEGER_ONLY_LIBRARY)	2m 25s
build (no-asm, --disable-asm-optimizations)	2m 44s
build (no-ogg, --disable-ogg)	2m 22s
	10m 43s

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