Apply seqtk PR to improve kseq.h parsing performance #173
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Doubles throughput; can now parse FASTA at 2GB/s.
jmarshall
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This applies @kloetzl's lh3/seqtk#123 to klib's kseq.h.
For one large data file on my machine, this reduces kseq_bench2's
kstreamtime from ~1.65s to ~0.92s.(I have not heavily tested it otherwise.)