added directions for building affinegap.c
added directions for building affinegap.c

dedupeio/dedupe,davidkunio/dedupe,dedupeio/dedupe,datamade/dedupe,tfmorris/dedupe,dedupeio/dedupe-examples,datamade/dedupe,davidkunio/dedupe,01-/dedupe,pombredanne/dedupe,nmiranda/dedupe,01-/dedupe,nmiranda/dedupe,neozhangthe1/dedupe,tfmorris/dedupe,pombredanne/dedupe,neozhangthe1/dedupe