This PR adds an updated version to the r-rhtslib package as well as fix
the build.
- add patches to use compiler flags from R
- add variables for bzip2 and xz dependencies
- use the spack Makeconf file when building the in-tree htslib
- make patchelf available to allow R to remove reference to temporary
installation directory in htslib shared object
- Add new version of r-rsamtools as the r-rsamtools and r-rhtlib
packages are closely paired.
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