gnu: vcflib: Use shared libraries.

gnu: vcflib: Use shared libraries.

* gnu/packages/bioinformatics.scm (vcflib)[source]: Add patch. Add
snippet to adjust files for new locations.
[inputs]: Add fastahack, smithwaterman, tabixpp, xz.
[native-inputs]: Add pkg-config. Remove the package-source of fastahack,
fsom, smithwaterman, tabixpp.
[arguments]: Remove make-flags. Add custom phase to add the output lib
directory to the rpath. Adjust custom 'unpack-submodule-sources for the
change in native-inputs. Adjust custom 'install phase to also install
libraries and headers.
* gnu/packages/patches/vcflib-use-shared-libraries.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.