[Debian-med-packaging] Bug#865010: htslib: use -fPIC to fix FTBFS on s390x

[Aaron M. Ucko]

Source: htslib
Version: 1.4.1-2
Followup-For: Bug #865010

FWIW, I suspect this patch will also help on the non-release
architecture sparc64, which encountered similar errors.

-- 
Aaron M. Ucko, KB1CJC (amu at alum.mit.edu, ucko at debian.org)
http://www.mit.edu/~amu/ | http://stuff.mit.edu/cgi/finger/?amu@monk.mit.edu