Zlib library order fix
Zlib library order fix

For some reason, the Travis-CI build didn't cope with the library order that worked on our cluster (having -lz and -lpthread before libhts.a), so here's a test commit to see if changing their order fixes the Travis-CI build.
arq5x/lumpy-sv,arq5x/lumpy-sv,arq5x/lumpy-sv,arq5x/lumpy-sv,arq5x/lumpy-sv