Fix building cbcf on Linux
Fix building cbcf on Linux

brendanofallon/pysam,brendanofallon/pysam,bioinformed/pysam,pysam-developers/pysam,carolinux/pysam,TyberiusPrime/pysam,TyberiusPrime/pysam,kyleabeauchamp/pysam,kyleabeauchamp/pysam,mattions/pysam,pysam-developers/pysam,mattions/pysam,pysam-developers/pysam,nlhepler/pysam,TyberiusPrime/pysam,dannon/pysam,nlhepler/pysam,TyberiusPrime/pysam,TyberiusPrime/pysam,daler/pysam,daler/pysam,carolinux/pysam,dannon/pysam,daler/pysam,carolinux/pysam,pysam-developers/pysam,mattions/pysam,brendanofallon/pysam,kyleabeauchamp/pysam,dannon/pysam,nlhepler/pysam,kyleabeauchamp/pysam,mattions/pysam,carolinux/pysam,nlhepler/pysam,daler/pysam,bioinformed/pysam,mattions/pysam,bioinformed/pysam,kyleabeauchamp/pysam,carolinux/pysam,bioinformed/pysam,daler/pysam,dannon/pysam,bioinformed/pysam,dannon/pysam,brendanofallon/pysam,brendanofallon/pysam,nlhepler/pysam