Create Bio::DB::HTS using static libhts

Marek Szubarequested to merge
github/fork/drjsanger/master into master

Created by: drjsanger

Hi @rishidev, these changes enable install of Bio::DB::HTS without the need for the htslib directory to remain. It forces the use of libhts.a at compile when using the INSTALL.pl method to install. We've tried and tested it but please do check yourself.

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