fixes for [CHEF-4177]

* remove -R/-rpath from ncurses LDFLAGS - Recent versions of GCC have gotten cranky when passed unrecognized options. We don't need to set `-R` or `-Wl,-rpath` in LDFLAGS as we already set a a path in the LD_RUN_PATH environment variable.
* set ncurses LD_OPTIONS on SmartOS - This environment variable is specific to Solaris flavored *nix and ensures the linker finds and links against other Omnibus dependencies.