Fixes needed to build htop (#3691)

* Fixes needed to build htop

* Build libncursesw.so, not libncurses.so

* Remove htop hack now that it is picking up newer ncurses

* Tell packages to link to new ncursesw libraries

var/spack/repos/builtin/packages/htslib/package.py

@@ -36,3 +36,4 @@ class Htslib(AutotoolsPackage):
 
     depends_on('zlib')
     depends_on('bzip2', when="@1.4:")
+    depends_on('xz')